← Product Code [HKX](/submissions/OP/subpart-b%E2%80%94diagnostic-devices/HKX) · K113066 # CORVIS ST (K113066) _Oculus Optikgerate GmbH · HKX · Nov 8, 2012 · Ophthalmic · SESE_ **Canonical URL:** https://fda.innolitics.com/submissions/OP/subpart-b%E2%80%94diagnostic-devices/HKX/K113066 ## Device Facts - **Applicant:** Oculus Optikgerate GmbH - **Product Code:** [HKX](/submissions/OP/subpart-b%E2%80%94diagnostic-devices/HKX.md) - **Decision Date:** Nov 8, 2012 - **Decision:** SESE - **Submission Type:** Traditional - **Regulation:** 21 CFR 886.1930 - **Device Class:** Class 2 - **Review Panel:** Ophthalmic ## Intended Use The Corvis ST is intended to measure the intra-ocular pressure of the eye in patients with less than 3 diopters of corneal astigmatism. In addition, the Corvis ST is designed to photograph the eye and take Scheimpflug images of the anterior segment of the eye to evaluate the thickness of the cornea. ## Device Story Corvis ST is a non-contact tonometer and pachymeter; operates by applying air puff to eye; high-speed camera captures >4000 images/second; analyzes 140 Scheimpflug images to determine intra-ocular pressure (IOP); pachymetry performed via sectional imaging when cornea is not influenced by air puff; used in clinical settings; operated by eye care professionals; output provides IOP and corneal thickness measurements; assists clinicians in evaluating anterior segment; benefits include non-invasive assessment of ocular pressure and corneal geometry. ## Clinical Evidence Clinical study (n=51, 102 eyes) compared Corvis ST pachymetry to Pachycam (K041841); correlation >0.98; mean difference -0.10 ± 4.48 µm; repeatability 3.03 µm. Tonometry study (n=120 eyes) compared Corvis ST to Goldmann applanation tonometer (GAT); mean deviation 0.2 ± 2.4 mmHg; 96.7% of eyes within ±5 mmHg of GAT. Bench testing (tonometry) showed correlation >0.99, mean difference -0.26 ± 1.1 mmHg. Bench testing (pachymetry) showed correlation >0.99, mean difference -0.43 ± 3.85 µm. ## Technological Characteristics Non-contact air-puff tonometer and Scheimpflug-based pachymeter. High-speed camera (>4000 fps). Complies with ANSI Z80.10-2009 and EN ISO 8612:2009. Pachymetry uses image processing routine shared with predicate Pachycam. Standalone device. ## Regulatory Identification A tonometer and accessories is a manual device intended to measure intraocular pressure by applying a known force on the globe of the eye and measuring the amount of indentation produced (Schiotz type) or to measure intraocular tension by applanation (applying a small flat disk to the cornea). Accessories for the device may include a tonometer calibrator or a tonograph recording system. The device is intended for use in the diagnosis of glaucoma. ## Predicate Devices - Nidek Incorporated, Non-Contact-Tonometer NT 1000 ([K913189](/device/K913189.md)) - Oculus Optikgeraete GmbH, Pachycam ([K041841](/device/K041841.md)) ## Reference Devices - Goldmann applanation tonometer (Haag-Streit) ## Related Devices - [K990257](/device/K990257.md) — KEELER PULSAIR 3000 NON CONTACT TONOMETER · Keeler Instruments, Inc. · Mar 25, 1999 - [K042831](/device/K042831.md) — ATP (AUTO NON-CONTACT TONOMETER/PACHYMETER) · Reichert, Inc. · Oct 28, 2004 - [K253039](/device/K253039.md) — AUTO KERATO-REFRACTO TONOMETER TRK-3 OMNIA · Topcon Corporation · Nov 7, 2025 - [K031733](/device/K031733.md) — NON-CONTACT TONOMETER, MODEL NT-4000 · Nidek, Inc. · Dec 4, 2003 - [K241447](/device/K241447.md) — iCare ST500 (TA04) · Icare Finland OY · Sep 27, 2024 ## Submission Summary (Full Text) {0}------------------------------------------------ # K113066 510(k) SUMMARY Oculus Optikgeraete GmbH Corvis ST # Submitter's Name, Address, Telephone Number, Contact Person and Date Prepared NOV ........ 1 Oculus Optikgeraete GmbH Muenchholzhaeuser Strasse 29 35582 Wetzlar Germany | Phone: | +49(0)641 2005-0 | |-----------------|--------------------| | Facsimile: | +49(0)641 2005-255 | | Contact Person: | Eckhard Loh | | Date Prepared: | November 7, 2012 | #### Name of Device and Name/Address of Sponsor Corvis ST Oculus Optikgeraete GmbH Muenchholzhaeuser Strasse 29 35582 Wetzlar Germany #### Common or Usual Name Non-Contact-Tonometer (Product Code HKX), Pachymeter (Product Code MXK) #### Classification Name 21 C.F.R. §886.1930, Tonometer (AC Powered), Analysis, Anterior Segment #### Predicate Devices Nidek Incorporated, Non-Contact-Tonometer NT 1000 (K913189) Oculus Optikgeraete GmbH, Pachycam (K041841) #### Intended Use / Indications for Use The Corvis ST is intended to measure the intra-ocular pressure of the eye in patients with less than 3 diopters of corneal astigmatism. In addition, the Corvis ST is designed to photograph the eye and take Scheimpflug images of the anterior segment of the eye to evaluate the thickness of the cornea. {1}------------------------------------------------ #### Technological Characteristics The Corvis ST performs the following two functions: #### Tonometry The Corvis ST measures intraocular pressure without contact with the eye by applying an air f your to the eye. The eye is illuminated and during the air puff, a high-speed camera records the movement of the eye with more than 4000 images per second. The high-speed camera analyzes a sequence of 140 Scheimpflug images of the cornea to determine intra-ocular pressure. #### Pachymetry The Corvis ST measure corneal thickness and shape based on sectional images when the cornea is not influenced by the air puff. The pachymetry measurements of the Corvis ST and the cleared Oculus predicate use the same image processing routine for analysis to obtain corneal thickness measurements. Tonometry and pachymetry functions can be performed during the same evaluation or separately. #### Performance Data #### Clinical Data - Pachymetry The "Side-by-side testing of Central Corneal thickness (Apex): Corvis ST vs. Pachycam" was an internal study to evaluate the correlation between the measurement data of the FDA cleared device Pachycam (K041841) and the Corvis ST. The study evaluated the apical thickness of the center (Pachymetry). Both eyes of each subject were measured and every eye was measured three times on the same device. The number of subjects was 51, so 102 eyes were examined. In the study, subjects were chosen with corneal thicknesses from 463 um to 635 um. #### Results: The correlation coefficient of the representative apical thickness value was > 0.98. The overall mean (+/- standard deviation) difference of the Corvis ST apical thickness measurements to the Pachycam was -0.10 ± 4.48 µm. The within-eye repeatability (standard deviation) of the Corvis ST for each set of triplicate results per eye per subject was calculated to be 3.03 µm. #### Clinical Data - Tonometry Testing was performed in conformance with ANSI Z80.10-2009 (in accordance with FDA's extent of recognition) and EN ISO 8612:2009. The aim of this evaluation was to compare the intraccular pressure (IOP) results measured by the Corvis ST tonometer with those obtained by the Goldmann applanation tonometer (Haag-Streit) over three IOP-groups. {2}------------------------------------------------ # Results: | | Difference IOP (Corvis ST) - IOP (GAT) | | | | |-------|----------------------------------------|---------------|------------------------------------------------------|--------------------------| | Group | Number of eyes | IOP<br>(mmHg) | Difference Corvis ST to reference<br>tonometer (GAT) | Within limits<br>(5mmHg) | | 1 | 40 | 7 - 16 | 0.8 ± 2.3 mmHg | 39 (97.5 %) | | 2 | 40 | > 16 - < 23 | -0.5 ± 2.2 mmHg | 38 (95 %) | | 3 | 40 | ≥ 23 | 0.3 ± 2.5 mmHg | 39 (97.5 %) | | total | 120 | 7-48 | 0.2 ± 2.4 mmHg | 116 (96.7 %) | The mean deviation between the test tonometer and the reference tonometer was 0.2 ± 2.4 mmHg. 96.7 % of the investigated eves were within the limits of ± 5 mmHo, no eve had a deviation to the reference tonometer of more than 7.5 mmHq. The Corvis ST meets all the requirements EN ISO 8612:2009 and to ANSI Z80.10-2009 (in accordance with FDA´s extent of recognition) if eyes with astigmatism >3 D are excluded in accordance with EN ISO 8612:2009. The agreement between the Corvis ST and the Goldmann applanation tonometer (GAT) is satisfactory, with a standard deviation of the difference between the Corvis measurement and the Goldmann measurement of 2.4 mmHq. # Bench Testing - Tonometry The company performed tonometric testing to evaluate the accuracy and reproducibility of the Corvis ST in its intended measuring range in accordance with FDA's extent of recognition section 4.2.3 "Bench Assessments of Bias and Precision" of ANSI Z80.10-2009, Ophthalmic Instruments -Tonometers (Ophthalmic). The testing was performed by measuring a manometric controlled test eye, which consisted of a membrane enclosed with a water filled pressure chamber. The pressure in the test chamber was adjusted by a hydrostatic head and controlled manometrically by an attached calibrated pressure sensor as reference. The measurements were taken using the Corvis ST device and additionally verified by a reference tonometer. # Results: In the tonometry bench test, the correlation coefficient of the representative IOP value was > 0.99. The overall difference of the Corvis ST measurements to the manometric adjusted pressure values was -0.26 ± 1.1 mmHg. The test bench results show that none of the paired differences between the reference tonometer reading and the test tonometer reading for each manometric adjusted pressure value are greater than +/- 5 mmHg and also that none of the paired differences between the reference tonometer reading and the test tonometer reading for each pressure range are greater than +/- 7.5 mmHg. {3}------------------------------------------------ # Bench Testing - Pachymetry The focus of this internal study was to demonstrate that the performance data of the Corvis ST is accurate and reproducible over the complete stated measurement range of 300 um. The testing was performed by measuring several glass plates with several known thicknesses, known scattering, and known refraction indices. #### Results: In the pachymetry bench test, the correlation coefficient of the representative pachymetry value was > 0.99. The overall difference of the Corvis ST measurements to the reference thickness values was -0.43 ± 3.85 µm. #### Substantial Equivalence The Corvis ST is substantially equivalent to the predicate devices. The Corvis ST has the same intended use, technological characteristics, and principles of operation as its predicate devices. Bench and clinical testing demonstrate substantially equivalent performance to the predicates. The minor technological differences between the Corvis ST and its predicate raise no new issues of safety and effectiveness. Performance data demonstrate that the Corvis ST is as safe and effective as the predicate devices. Thus, the Corvis ST is substantially equivalent. {4}------------------------------------------------ # DEPARTMENT OF HEALTH & HUMAN SERVICES Public Health Service Food and Drug Administration 10903 New Hampshire Avenue Document Control Center - WO66-G609 Silver Spring, MD 20993-002 OCULUS Optikgeraete GmbH % Mr. Eckhard Loh Regulatory Affairs Manager Munchholzhauser Str. 29 Wetzlar Germany D-35582 Re: K113066 Trade/Device Name: OCULUS Corvis® ST model 72210 Regulation Number: 21 CFR 886.1930 Regulation Name: Tonometer, AC-powered Regulatory Class: Class II Product Code: HKX, MXK Dated: October 24, 2012 Received: October 24, 2012 Dear Mr. Loh: 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 (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. 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. {5}------------------------------------------------ Page 2 -- Mr. Eckhard Loh Please be advised that FDA's issuance of a substantial equivalence determination docs 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 (reporting of medical device-related adverse events) (21 CFR 803); good manufacturing practice requirements as set forth in the quality systems (QS) regulation (21 CFR Part 820); and if applicable, the electronic product radiation control provisions (Sections 531-542 of the Act); 21 CFR 1000-1050. If you desire specific advice for your device on our labeling regulation (21 CFR Part 801), please go to http://www.fda.gov/AboutFDA/CentersOffices/CDRH/CDRHOffices/ucm115809.htm for the Center for Devices and Radiological Health's (CDRH's) Office of Compliance. Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21CFR Part 807.97). For questions regarding the reporting of adverse events under the MDR regulation (21 CFR Part 803), please go to http://www.fda.gov/MedicalDevices/Safety/ReportaProblem/default.htm for the CDRH's Office of Surveillance and Biometrics/Division of Postmarket Surveillance. You may obtain other general information on your responsibilities under the Act from the Division of Small Manufacturers, International and Consumer Assistance at its toll-free number (800) 638-2041 or (301) 796-7100 or at its Internet address http://www.fda.gov/MedicalDevices/Resourcesfor You/Industry/default.htm. Sincerely yours, # Kesia Y. Alexander Malvina B. Eydelman, M.D. Director Division of Ophthalmic and Ear, Nose and Throat Devices Office of Device Evaluation Center for Devices and Radiological Health Enclosure {6}------------------------------------------------ | Corvis ST | Indications for Use<br>Statement | Image: OCULUS logo | |-----------|----------------------------------|--------------------| |-----------|----------------------------------|--------------------| # Indications for Use Statement 510(k) Number (if known): K113066 Device Name: Corvis ST # Indications for Use: The Corvis ST is intended to measure the intra-ocular pressure of the eye in patients with less than 3 diopters of corneal astigmatism. In addition, the Corvis ST is designed to photograph the eye and take Scheimpflug images of the anterior segment of the eye to evaluate the thickness of the cornea. Prescription Use (Part 21 CFR 801 Subpart D) AND/OR Over-The-Counter Use (21 CFR 801 Subpart C) (PLEASE DO NOT WRITE BELOW THIS LINE-CONTINUE ON ANOTHER PAGE IF NEEDED) fice of Device Evaluation (ODE) Concurrence of CDRH, (Division Sign-Off) Division of Ophthalmic, Neurological and Ear, Nose and Throat Devices 510(k) Number K113066 Page 1 of 1 \\DC - 027529/00001 - 3710581 v1 --- **Source:** [https://fda.innolitics.com/submissions/OP/subpart-b%E2%80%94diagnostic-devices/HKX/K113066](https://fda.innolitics.com/submissions/OP/subpart-b%E2%80%94diagnostic-devices/HKX/K113066) **Published by [Innolitics](https://innolitics.com)** — a medical-device software consultancy. We help companies design, build, and clear FDA-regulated software and AI/ML devices. 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