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Quality of vision scoring method: a system to measure vision performance – 12 years experience

Poster Details

First Author: N.Hauranieh ITALY

Co Author(s):    P. Giardini                    

Abstract Details


Quality of vision is a set of measures that include visual performance at near, intermediate and far distance. Visual acuity is an important part of visual quality but also reading speed, contrast sensitivity, social reading, presence or absence of dysphotopsia are also important factors. There is a need to quantify some parameters together with visual acuity and to transform subjective data into objective ones so as to give a score to the concept of quality of vision. These requirements will help clinicians to better measure quantitatively the performance of new medical and surgical devices and procedures.


Polivisus Diagnostic and Ophthalmic Microsurgery Clinic - Brescia (IT)


During the last 12 years, quality of vision scoring technique was tested using charts and a tablet based system developed by authors (first generation tablet Pc and now a Retina Display Tablet). The quality of vision scoring technique evaluated: near and intermediate visual acuity, reading speed, contrast sensitivity, social reading test for near and intermediate, dysphotopsia test, digital defocus curve test. About 10.000 tests where performed for patients aged between (18-80 years old). Emmetropic patients, patients with refractive errors, pre-op. and follow-up post-op. scoring was also completed after laser refractive procedures, surgical IOL and Premium IOL implantation.


Near Visual acuity: there were no statistically difference between visual acuity using charts or a tablet high quality Retina screen. Reading speed: Difference between critical print size for visual acuity and reading speed was noticed. Social reading for near and intermediate: simulating and scoring a real size images from real life was fundamental for follow-up in all patients. Dysphotopsia: scoring dysphotopsia is an important method to quantify a subjective symptom and follow-up. Defocus curve: a digital defocus curve creation for each Premium IOL to know more and suggest the more suitable one for each patient’s need.


Measuring subjective situations and transforming it to objective results giving a score is an important procedure for patients to understand changes in their vision quality. Fundamental procedure for ophthalmologists to follow-up results after surgery and to evaluate the difference between each procedure. Visual acuity is still an important and fundamental measurement but also digital technology is helping to manage the quality of vision performance.

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