Refraction : patients are sensitive to increments smaller than a quarter diopter !Click here to read the article

Traditionally, in the ophthalmic lens industry optical corrections have been offered in increments no smaller than 0.25 D. But patients are often sensitive to smaller dioptric changes. A study carried out by Essilor International at its Singapore R&D centre with a representative sample of patients showed that 95% were sensitive to dioptric changes of under 0.25 D and that 44% could distinguish between changes of less than 0.125 D. This article presents the results of the study and demonstrates how a patient’s sensitivity can influence the precision of their refraction result. It also explores the outlook offered by the new high-precision subjective-refraction techniques and the ophthalmic lenses associated with them.



Article from the magazine "Point de vue"

points de vue