The LFR-260 is a portable manual refractor providing capabilities to the eyecare provider to perform distance vision testing and subjectively measure sphere, cylinder and axis refractive errors in patients aged from 12-65 years old with healthy visual systems. The device measures spherical error in the range of -10 to +15D and measures cylinder error within +/- 2.5D.
Device Story
Portable digital refractor; replaces traditional lens reels with micro lens array, high-density display, and tunable lenses. Used by licensed eye care practitioners in clinics or home healthcare environments to perform distance vision testing. Inputs include standard optotypes (Snellen, ETDRS, Landolt C, pediatric); device displays these to patient. Practitioner performs subjective refraction (sphere, cylinder, axis) using fan/block tests or Jackson cross-cylinder (JCC). Output is refractive error measurement; used by practitioner to determine corrective lens prescriptions. Benefits include increased portability and smaller footprint compared to traditional phoropters.
Clinical Evidence
Clinical study compared LFR-260 refractive measurements to predicate. Bland-Altman analysis across three age groups (<=21, 22-40, 40-60) showed measurements within 95% Limits of Agreement (LOA): 0.75D for M, 0.5D for J0 and J45. Specific ranges: M (-0.52D to 0.41D), J0 (-0.3 to +0.23), J45 (-0.13 to +0.13). Precision testing confirmed acceptable repeatability and reproducibility.
Technological Characteristics
Portable manual refractor; utilizes micro lens array, tunable lenses, and high pixel-density display. Measures spherical error (-10 to +15D) and cylinder error (+/- 2.5D). Bench testing per ANSI Z80.21-2020 for visual acuity charts/luminance. Includes cooling system for tunable lenses. Proprietary software controls system.
Indications for Use
Indicated for distance vision testing and subjective measurement of sphere, cylinder, and axis refractive errors in patients aged 12-65 years with healthy visual systems.
Regulatory Classification
Identification
A manual refractor is a device that is a set of lenses of varous dioptric powers intended to measure the refractive error of the eye.
{0}------------------------------------------------
May 31, 2024
Image /page/0/Picture/1 description: The image shows the logo of the U.S. Food and Drug Administration (FDA). On the left is the Department of Health & Human Services logo. To the right of that is the FDA logo, which is a blue square with the letters "FDA" in white. To the right of the blue square is the text "U.S. FOOD & DRUG ADMINISTRATION" in blue.
Evolution Optiks Limited % John Smith Partner Hogan Lovells US LLP 555 13th Street NW Washington, District of Columbia 20004
# Re: K233295
Trade/Device Name: LFR-260 Regulation Number: 21 CFR 886.1770 Regulation Name: Manual Refractor Regulatory Class: Class I Product Code: SBI Dated: May 3, 2024 Received: May 3, 2024
# Dear John Smith:
We have reviewed your section 510(k) premarket notification of intent to market the device referenced above and have determined the device is substantially equivalent (for the indications for use stated in the enclosure) to legally marketed predicate devices marketed in interstate commerce prior to May 28, 1976, the enactment date of the Medical Device Amendments, or to devices that have been reclassified in accordance with the provisions of the Federal Food, Drug, and Cosmetic Act (the Act) that do not require approval of a premarket approval application (PMA). You may, therefore, market the device, subject to the general controls provisions of the Act. Although this letter refers to your product as a device, please be aware that some cleared products may instead be combination products. The 510(k) Premarket Notification Database available at https://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfpmn/pmn.cfm identifies combination product submissions. The general controls provisions of the Act include requirements for annual registration, listing of devices, good manufacturing practice, labeling, and prohibitions against misbranding and adulteration. Please note: CDRH does not evaluate information related to contract liability warranties. We remind you, however, that device labeling must be truthful and not misleading.
If your device is classified (see above) into either class II (Special Controls) or class III (PMA), it may be subject to additional controls. Existing major regulations affecting your device can be found in the Code of Federal Regulations, Title 21, Parts 800 to 898. In addition, FDA may publish further announcements concerning your device in the Federal Register.
Additional information about changes that may require a new premarket notification are provided in the FDA guidance documents entitled "Deciding When to Submit a 510(k) for a Change to an Existing Device" (https://www.fda.gov/media/99812/download) and "Deciding When to Submit a 510(k) for a Software Change to an Existing Device" (https://www.fda.gov/media/99785/download).
{1}------------------------------------------------
Your device is also subject to, among other requirements, the Quality System (QS) regulation (21 CFR Part 820), which includes, but is not limited to, 21 CFR 820.30, Design controls; 21 CFR 820.90, Nonconforming product; and 21 CFR 820.100, Corrective and preventive action. Please note that regardless of whether a change requires premarket review. the OS regulation requires device manufacturers to review and approve changes to device design and production (21 CFR 820.30 and 21 CFR 820.70) and document changes and approvals in the device master record (21 CFR 820.181).
Please be advised that FDA's issuance of a substantial equivalence determination does not mean that FDA has made a determination that your device complies with other requirements of the Act or any Federal statutes and regulations administered by other Federal agencies. You must comply with all the Act's requirements, including, but not limited to: registration and listing (21 CFR Part 807); labeling (21 CFR Part 801); medical device reporting of medical device-related adverse events) (21 CFR Part 803) for devices or postmarketing safety reporting (21 CFR Part 4, Subpart B) for combination products (see https://www.fda.gov/combination-products/guidance-regulatory-information/postmarketing-safety-reportingcombination-products); good manufacturing practice requirements as set forth in the quality systems (QS) regulation (21 CFR Part 820) for devices or current good manufacturing practices (21 CFR Part 4, Subpart A) for combination products; and, if applicable, the electronic product radiation control provisions (Sections 531-542 of the Act); 21 CFR Parts 1000-1050.
Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21 CFR 807.97). For questions regarding the reporting of adverse events under the MDR regulation (21 CFR Part 803), please go to https://www.fda.gov/medical-device-safety/medical-device-reportingmdr-how-report-medical-device-problems.
For comprehensive regulatory information about mediation-emitting products, including information about labeling regulations, please see Device Advice (https://www.fda.gov/medicaldevices/device-advice-comprehensive-regulatory-assistance) and CDRH Learn (https://www.fda.gov/training-and-continuing-education/cdrh-learn). Additionally, you may contact the Division of Industry and Consumer Education (DICE) to ask a question about a specific regulatory topic. See the DICE website (https://www.fda.gov/medical-device-advice-comprehensive-regulatoryassistance/contact-us-division-industry-and-consumer-education-dice) for more information or contact DICE by email (DICE@fda.hhs.gov) or phone (1-800-638-2041 or 301-796-7100).
Sincerely,
Elvin Y. Ng -S
Elvin Ng Assistant Director DHT1A: Division of Ophthalmic Devices OHT1: Office of Ophthalmic, Anesthesia, Respiratory, ENT and Dental Devices Office of Product Evaluation and Quality Center for Devices and Radiological Health
{2}------------------------------------------------
Enclosure
{3}------------------------------------------------
# Indications for Use
510(k) Number (if known) K233295
Device Name LFR-260 System
#### Indications for Use (Describe)
The LFR-260 is a portable manual refractor providing capabilities to the evecare provider to perform distance vision testing and subjectively measure sphere, cylinder and axis refractive errors in patients aged from 12-65 years old with healthy visual systems. The device measures spherical error in the range of -10 to +15D and measures cylinder error within +/- 2.5D.
| Type of Use (Select one or both, as applicable) | |
|---------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------|
| <div style="display:inline-block;">Prescription Use (Part 21 CFR 801 Subpart D)</div> | <div style="display:inline-block;">Over-The-Counter Use (21 CFR 801 Subpart C)</div> |
#### CONTINUE ON A SEPARATE PAGE IF NEEDED.
This section applies only to requirements of the Paperwork Reduction Act of 1995.
#### *DO NOT SEND YOUR COMPLETED FORM TO THE PRA STAFF EMAIL ADDRESS BELOW.*
The burden time for this collection of information is estimated to average 79 hours per response, including the time to review instructions, search existing data sources, gather and maintain the data needed and complete and review the collection of information. Send comments regarding this burden estimate or any other aspect of this information collection, including suggestions for reducing this burden, to:
> Department of Health and Human Services Food and Drug Administration Office of Chief Information Officer Paperwork Reduction Act (PRA) Staff PRAStaff(@fda.hhs.gov
"An agency may not conduct or sponsor, and a person is not required to respond to, a collection of information unless it displays a currently valid OMB number."
{4}------------------------------------------------
# K233295
#### 510(k) SUMMARY
#### Evolution Optiks LFR-260 System
#### Submitter
#### Evolution Optiks Limited
PASEA FINANCIAL CENTRE CORNER HARTS GAP & DAYRELLS ROAD CHRIST CHURCH BARBADOS BB14030
Phone: (203) 981 5489
Contact Person: Raul Mihali
Date Prepared: May 30, 2024
#### 1. Device Information
Name of Device: LFR-260 System Common or Usual Name: Manual Refractor Classification Name: Manual Refractor
Regulation Number: 21 C.F.R. 886.1770
Product Code: SBI
Regulatory Class: Class I
# 2. Predicate Device Information
510(k) number K936205
Trade name: Comprehensive Phoropter, MDR-680
Classification Name: Manual Refractor
Regulation Number: 21 C.F.R. 886.1770
#### 3. Device Description
The LFR-260 is a portable digital refractor which allows for determination of refractive error as well as for fully remote refractions. The LFR-260 achieves the similar functionality as Comprehensive
{5}------------------------------------------------
Phoropter, MDR-680, which is a standard refractor, but relies on the use of a micro lens array, a highdensity embedded display, and a tunable lens. The reduced number of lenses allows for higher portability and a smaller footprint.
The LFR-260 system is able to perform the same distance vision traditional refractive test with the standard optotypes (Snellen, ETDRS, Landolt C, pediatric optotypes) as a standard refractor, such as:
- Determining the required spherical correction ●
- . Determining the required astigmatic correction measuring with fan and block test and/or JCC (Jackson cross-cylinder)
The visual acuity tests will always be administered by an eye care practitioner licensed and registered by the appropriated body in the region intended to be used.
# 4. Intended Use / Indications for Use
The LFR-260 is a portable manual refractor providing capabilities to the eyecare provider to perform distance vision testing and subjectively measure sphere, cylinder and axis refractive errors in patients aged from 12-65 years old with healthy visual systems. The device measures spherical error in the range of -10 to +15D and measures cylinder error within +/- 2.5D.
# 5. Summary of Technological Characteristics
The intended use of LFR-260 is consistent with Comprehensive Phoropter, MDR-680, which is a manual refractor. The substantial equivalence table is provided below:
| | LFR-260 | Comprehensive Phoropter,<br>MDR-680 | Discussion |
|----------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Technological<br>Characteristics | The LFR-260 system<br>includes a micro lens array,<br>tunable lenses, and high<br>pixel-density display to<br>provide the same<br>functionality as a<br>traditional reel of lenses to<br>allow the measure of<br>refractive error of the eye. | The Comprehensive<br>Phoropter, MDR-680, is a<br>manual refractor and is<br>defined as a device that is<br>a set of lenses of various<br>dioptric powers intended<br>to measure the refractive<br>error of the eye. | Differences in<br>technological<br>characteristics do<br>not raise different<br>questions of<br>safety and<br>effectiveness.<br>Performance data<br>demonstrates<br>comparable<br>performance and<br>safety. |
| Overview of Device | The LFR-260 is a portable<br>manual refractor providing<br>capabilities to the eyecare<br>provider to perform<br>distance vision testing and<br>subjectively measure<br>sphere, cylinder and axis<br>refractive errors in patients<br>aged from 12-65 years old<br>with healthy visual systems. | The Comprehensive<br>Phoropter, MDR-680 is<br>regulated under 886.1770,<br>primary product code HKN.<br>A manual refractor, which<br>is a device that is a set of<br>lenses of various dioptric<br>powers intended to<br>measure the refractive<br>error of the eye. | Both devices are<br>intended to<br>measure<br>refractive error of<br>the eye. |
| Operation/Tests<br>Available | The LFR-260 device<br>provides similar subjective | As a manual refractor, the<br>comprehensive phoropter | Substantially<br>similar. Both |
| | refraction as manual<br>refractors including sphere,<br>cylinder, and axis<br>measurements.<br>The LFR-260 can be used<br>to administer comparable<br>eye examination that is<br>standard of care in eye care<br>professionals' clinics.<br>Specifically, the LFR-260 is<br>able to perform comparable<br>traditional refractive tests<br>with the standard optotypes<br>(e.g., Snellen, ETDRS,<br>Landolt C, pediatric<br>optotypes) such as:<br>• Determining the required<br>spherical correction<br>• Determining the required<br>astigmatic correction<br>measuring with fan and<br>block test and/or JCC<br>(Jackson cross-cylinder) | MDR-680 provides<br>subjective refraction<br>including sphere, cylinder<br>and axis measurements. It<br>can be used to administer<br>the eye examination that is<br>standard in eye care<br>professionals' clinics.<br>Manual refractors can<br>perform traditional<br>refractive tests such as:<br>• Determining the required<br>spherical correction<br>• Determining the required<br>astigmatic correction<br>measuring | systems provide<br>examinations to<br>measure<br>refractive error of<br>the eye. The LFR-<br>260, however is<br>indicated for<br>distance vision<br>testing only. |
| Type of Display | High pixel-density display | Traditional screen is used<br>to display eye charts | A high pixel-<br>density display is<br>used to view the<br>eye charts with<br>the subject device<br>while a traditional<br>screen is used<br>with manual<br>refractors.<br>Though there are<br>technological<br>differences, both<br>displays provide<br>users with eye<br>charts for use<br>during a routine<br>eye examination.<br>There are no new<br>questions of<br>safety or<br>effectiveness due<br>to this difference. |
| Type of Lenses | Tunable Lenses | Traditional reel of lenses | Both types of<br>lenses enable the<br>devices to<br>perform<br>subjective<br>refractive tests.<br>There are no new<br>questions of<br>safety or<br>effectiveness due<br>to this difference. |
| Included Software | Proprietary Software used<br>to control the LFR-260<br>system by an ECP | No software required | The software<br>controls the LFR-<br>260 to achieve its<br>intended use.<br>There are no new<br>questions of<br>safety or<br>effectiveness. |
| Use Environment | Professional Healthcare<br>Facility<br>Environment/Optometric<br>Clinics,<br>Home Healthcare<br>Environment | Professional Healthcare<br>Facility<br>Environment/Optometric<br>Clinics | Differences in use<br>environment do<br>not impact the<br>intended use of<br>the device.<br>There are no new<br>questions of<br>safety or<br>effectiveness.<br>Performance data<br>demonstrates<br>comparable<br>performance and<br>safety. |
| Intended User | Licensed eye care<br>practitioner | Licensed eye care<br>practitioner | Same |
{6}------------------------------------------------
{7}------------------------------------------------
# 6. Performance Data
Both bench and clinical testing were performed to demonstrate that LFR-260 performs safely and effectively in achieving its intended use.
The LFR-260 underwent bench testing to evaluate the following characteristics:
- Visual acuity chart or display with specified size, distance, and range of acceptable luminance ● based on the standard of ANSI Z80.21-2020.
- Lenses to measure refractive error. .
- Jackson Cross Cylinder (JCC) unit. ●
- Inter-Pupillary Distance (IPD). ●
Additionally, the system was evaluated to ensure it is able to produce both double and quad view and the ability of the cooling system to maintain the temperature of the tunable lenses.
In all instances, LFR-260 functioned as intended and each test's pre-specified success criteria were met.
The company also performed clinical testing to demonstrate comparability of the device's refractive measurements to the predicate device.
Based on Bland Altman analysis, in three subgroups (<=21, 22-40 and 40-60 years of age), the measurements were within 95% Limits of Agreement (LOA), defined as 0.75D for M and 0.5D for J0 and J45 (-0.52D to 0.41D for M, -0.3 to +0.23 for J0 and -0.13 to +0.13 for J45).
Precision testing was also performed. All sub-tests indicated acceptable repeatability and reproducibility.
{8}------------------------------------------------
Based on the clinical performance as documented in the pivotal clinical study, the LFR-260 has a safety and effectiveness profile that is similar to Comprehensive Phoropter, MDR-680.
### 7. Conclusions
The LFR-260 system and a manual refractor have the similar intended use, performs the similar examinations, and provides the same output. Both systems are used by a licensed eye care practitioner. The outputs of the LFR-260 are the same as a traditional refraction exam performed using a manual refractor. Even though there are technological differences do not raise different questions of safety and effectiveness as demonstrated through bench and clinical testing. Thus, the LFR-260 is substantially equivalent to Comprehensive Phoropter, MDR-680.
Predicate graph will load when search results are available.
Embedding visualization will load when search results are available.
PDF viewer will load when search results are available.
Loading panels...
Select an item from Submissions
Click any panel, subpart, regulation, product code, or device to see details here.
Section Matches
Results will appear here.
Product Code Matches
Results will appear here.
Special Control Matches
Results will appear here.
Loading collections...
Loading
My Alerts
You will receive email notifications based on the filters and frequency you set for each alert.
Sort by:
Create Alert
Search Filters
Agent Token
Create a read-only bearer token for Claude, ChatGPT, or other agents that can call HTTP APIs.
Copy this now. It will not be shown again.
Connected apps
Apps you authorized through browser sign-in. Disconnecting revokes their access immediately.
Learn the FDA Browser
Two short videos show you everything — or skip straight to the written tutorial if you'd rather read. You can reopen this any time from the Tutorial button in the top bar.
Part 1 — Search, results, and everyday workflows 16 min
Part 2 — Embeddings: the galaxy map 3 min
1. Search: exact and fuzzy
Type a phrase like "coronary artery calcification" into the search box. You get two kinds of results. Exact results match the literal phrase — prefix searches work ("coronary artery calcificati") but suffix searches do not. Fuzzy results match on the meaning and intent of your phrase rather than the exact words, and are sorted by relevance score. Hover over the Exact or Fuzzy badge on any row to see exactly why it matched.
Use the checkboxes above the results to narrow: SaMD keeps only software-only devices, AI / ML keeps only devices with AI.
Exact vs. fuzzy search: what's the difference?
Exact matches on the literal phrase (prefix search works, suffix does not). Fuzzy matches on the meaning and intent of the phrase rather than the exact words. Hover over the badge on any row to see why it matched.
You search "coronary artery calcification" and want only software devices with AI. What two filters do you apply?
Narrow by SaMD (software-only devices), then narrow by AI/ML (devices with AI).
2. The results table
Scroll right in the results table. The intended use is extracted for you — no need to open the PDF. The device story gives a high-level snapshot of what the device does and how it's used. The AI Performance sub-table shows each output name, acceptance criteria, observed values, and development/test dataset descriptions — the same format Innolitics uses for regulatory strategy outputs, and the fastest high-level fingerprint of an AI device. It is AI-generated but has been very reliable in practice.
Where do you find a device's intended use without opening the PDF?
Scroll right in the search results table. The intended use column is extracted for you; no need to dig into the 510(k) summary PDF.
What does the AI Performance sub-table show, and why is it useful?
Output name, acceptance criteria, observed values, development dataset description, and test dataset description. It's the same format we use for regulatory strategy output and Fast 510(k) input, and the fastest high-level fingerprint of an AI device. AI-generated but reliable in practice.
3. Judging fuzzy relevance
Fuzzy results trail off in relevance as you scroll. Use three signals to decide how far down to go: the fuzzy badge explanations, the intended use column, and whether your target output (e.g., Cobb angle) still appears in the AI Performance sub-table. Once it stops appearing, you're past the relevant zone. A top hit with a low score (~0.4) and a stretched explanation is a hint the closest predicates are far away — the project may be headed for De Novo. Note the fuzzy search is a pattern match: it doesn't handle negation ("not") well, and hardware devices can appear — filter by SaMD/AI ML to cut them.
How do you judge how far down fuzzy search results to go?
Use the relevancy signals: the fuzzy badge explanations, the intended use column, and whether the target output (e.g., Cobb angle) still appears in the AI Performance sub-table. Once it stops appearing, results are trailing off in relevancy.
4. Device detail page: chat and citations
Click a device name to open its detail page: device facts on the left, a chat window on the right. Ask something like "Describe the training data". The answer carries little citation bubbles — click one to jump to the highlighted passage in the source PDF, so you can verify every AI answer against the document. There's also a Download PDF button for sharing.
How do you verify an AI chat answer on the device detail page?
Click the citation bubbles to jump to the relevant highlight in the source document.
Reading rule for every project: how many summaries do you read in full?
At least the three most relevant 510(k) or De Novo summaries, in full. After that, use targeted chat questions to confirm your memory quickly. The tool supports this professional habit — it doesn't replace it.
5. Side-by-side comparison
Select multiple rows in the results table (aim for under ~10), then open the PDF Viewer tab. Ask one question — it goes to all selected devices in parallel, each with citations. This is the fastest way to compare and contrast devices: training data, PCCP scope, how they handled adding new scanners, and so on.
What does the side-by-side PDF viewer mode do?
Select multiple devices, open the PDF viewer tab, and ask one question (e.g., "Describe the training data"). It queries all selected devices simultaneously with citations, so you can compare and contrast quickly.
6. Collections
With rows selected, go to the Collections tab and create a labeled collection (e.g., "Cobb Angle Project"). Reload that selection any time — before a client call, pull up the collection and ask questions across all of its devices at once.
How do you save a set of selected devices for later use?
Select the rows, go to the Collections tab, and create a labeled collection (e.g., "Cobb Angle Project"). You can reload the selection anytime and carry it into the PDF viewer and other tabs that support selections.
7. Product codes and the regulations tree
Click a product code in the results to jump to it in the regulations tree — identification text, sibling product codes, and devices you can open in a PDF viewer on the right. Click a regulation number to see its identification, special controls, and related product codes. You can also search by product code or regulation number at the top of the tree. Always read the special controls if any exist for your device — it broadens your search and sharpens pre-kickoff research.
What can you do from the regulations tree view?
Browse product codes and regulation numbers, read the identification text and special controls, browse sibling product codes, open device PDFs on the right, and search by product code or regulation number at the top of the tree.
8. Chart view
Click Show Chart and segment by regulation number (or product code) to see which regulations dominate your result set. Clicking a regulation takes you into the regulations tree. Great for spotting that most matches are, say, hardware laparoscopic devices — a cue to go back and filter.
How do you see which regulations dominate a search result set?
Click "Show Chart" and segment by Regulation Number. Clicking a regulation takes you to the regulations tree.
9. The predicate graph
Open the Predicates tab for a family-tree view of predicate relationships. Click a node to trace its parents and children; selections from search carry over pre-selected. Commonly predicated devices are worth reading — a lot of people predicated them for a reason. The visual lineage is also handy on client calls, e.g. to show how a predicate family evolved and justify why your predicate still holds.
In the predicate graph, why are commonly predicated devices worth reading?
A lot of people predicated them for a reason. Clicking a node traces parents and children, and selections from search carry over pre-selected.
10. Embeddings: the galaxy map
The Embeddings tab plots every matching document in a 2-D "galaxy map" where semantically similar devices cluster together. Hover or click clusters to explore, and let AI label the clusters for you. Embeddings beat product codes for grouping: two devices can carry different product codes (LLZ vs. QIH) yet do the same thing — the embedding captures the meaning of the intended use and device story. This is also exactly how retrieval-augmented generation (RAG) works under the hood, and it makes a great visual on client calls.
Try it yourself
Head to the search page and work through a few of these AI/ML fuzzy searches to build intuition: perivascular fat on CT · aortic valve calcification opportunistic screening on noncontrast CT · breast cancer prediction on digital pathology slides · autism detection · gestational age prediction · a hearing aid that can also detect a pulse · foundation model based analysis of ECG · large language models · penetration test. Watch how the relevance scores, intended use, and AI Performance tables tell you when results stop being meaningful.