Efficacy of Enchroma eye glasses on chromatic discrimination in Thai congenital red-green deficiency

Abstract

Abstract

Objective To test the efficacy of Enchroma glasses in improving vision in Thai population with congenital green and red perception.

Methods Diagnostic test study was conducted in an ophthalmology outpatient department , Thammasat University, Thailand, During 5 November 2019 – 16 December 2020

Results All 60 participants are separated into Green, Red, and Green and Red type cases. 39 Green cases (65%), 15 Red cases (25%), and 6 Green and Red type cases (10%). The severity of the eyes’ color perception is categorized into mild, moderate, and severe, with values 11.7%, 73.3%, 15.0% respectively. The Ishihara test before and after wearing Enchroma glasses had a P-value of 0.004. The Farnsworth test before and after wearing Enchroma glasses had a P-value of 0.606. The severity of the color deficiency before and after wearing the Enchroma glasses had a P-value of 0.597.

Conclusion The Ishihara test results before and after wearing Enchroma glasses revealed that the glasses can assist the patients in reading the Ishihara as they received a higher score in comparison to when the glasses are not worn; this had a P-value of 0.004. However, in the Farnsworth test, there is no difference between before and after wearing the glasses  with a P-value of 0.606. There are also no significant differences found in the severity of the chromatic aberration when comparing between before and after wearing the glasses, with a P-value of 0.597. In conclusion,this research shows that the Enchroma glasses improve the ability to read the Ishihara test. However, the glasses cannot  improve the severity of the color deficiency, or the ability to read the Farnsworth test.