NUS Enterprise

Portable Eye Diagnostic Device

Technology #2016-223

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Portable Eye Diagnostic Device


To perform gonioscopy using an affordable, stand-alone and portable device to detect angle-closure glaucoma in the community by non-ophthalmologists

Intellectual Property

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Non-exclusive licensing

Partnership in commercial development


NUS Ref: 2016-223

Dr. Timothy Phua (

Industry Liaison Office, NUS Enterprise

Inventor Names: Victor Koh, Md Azri  


  • Portable, affordable, easy-to-use and stand-alone gonioscopy device 

Technology Overview

Angle closure glaucoma (ACG) is an irreversible blinding disease which is more common in Asia which is associated with high eye pressure. Gonioscopy is a clinical examination which is still the most cost efficient manner of diagnosing the condition and screening for earlier stages of the disease. However, ACG is largely asymptomatic and currently, there is poor awareness of this condition in the community. When detected early, there are effective and safe treatments available.

Unfortunately, currently, gonioscopy requires a skilled ophthalmologist to perform and the examination suffers from poor reproducibility and expensive equipment. The alternatives are not suitable to be deployed in the community. As such, to date, screening and diagnosis of ACG is suboptimal.

The proposed Victaz device is an user-friendly, portable and affordable solution for the non-ophthalmologist to perform ACG screening in the community. It requires minimal contact with the eye and designed to be maneuvered with ease. The user is guided from the beginning using propriety software to optimize wide-field image capture and the photographic documentation can be easily graded to diagnose angle closure.  

Technology Features

This invention describes a new device to achieve high-resolution imaging utilizing an 8 megapixel camera in conjunction with a microcomputer equipped with algorithms to auto acquire and grade anterior chamber images for ACG. Through a creative way of camera placement between the light source, polarizing filters, gonioscopy lens and the eyes, sharp, glare-free and magnified optical images can be obtained. This work is important in ophthalmology as it provides an objective, reliable, faster and simpler way of diagnosing the ACG than what is currently available.

FIG 1 (a) and (b) Anterior Chamber image of a prosthetic eye taken using Victaz


FIG 2 (a) Prototype

Development Status

Proposed invention has been successfully implemented and verified by simulation and testing setup. The prototype has been tested and datais available for demonstration to interested parties.


Dr. Victor Koh is an Associate Consultant with the Department of Ophthalmology, National University Hospital, Singapore. He graduated with M.B.B.S (Singapore) in 2007 and received his ophthalmology specialist accreditation in 2016. His main research interest includes medical devices related to ophthalmology in general and particularly in the management of glaucoma.

Muhammad Azri is a Research Engineer under the supervision of A/Prof. Zhao Qi. He received his Bachelor in Engineering from NUS in 2013. His research interests include CAD, 3D Printing, Image Processing, Coding and Machine Learning.

Ref : ID15112N