Effect of short-term exposure of red light on axial length, anterior chamber depth and visual acuity among young myopes

Purpose: evaluation of the effects of red-light exposure on vision and ocular measurements after a 3-minute exposure. Material and methods. A Quasi experimental study was conducted. The non-random purposive sampling technique was used. The study included 41 patients with myopia. Both genders were included where the female were 90.24% while male were 9.76%. The mean age for females was 23.15 ± 1.58 (range: 19–24 years) and for males was 23 ± 2.16 (range: 20–25 years). Patient’s visual acuity (VA) was assessed with ETDRS chart while axial length (AL), anterior chamber depth (ACD), non-cylcloplegic spherical equivalent refraction (SER), keratometry readings were recorded using IOL Master before and after exposure. To provide exposure an Android mobile application called “SCREEN FLASH” was used in a dark room. The patient was exposed to the Red Screen utilizing 650 nm red light for 3 minutes. SPSS 26 was used for statistical analysis. Results. Significant changes were observed in preand post biometric readings. The mean value of VA increased from 0.68 ± 0.33 to 0.58 ± 0.31 log MAR, (p-value < 0.001), AL decreased from 24.54 ± 1.05 to 24.53 ± 1.05 mm (p-value = 0.001), SER decreases from 4.5 ± 0.85 to 4.47 ± 0.97 D (p-value < 0.001) and ACD decreased from 3.64 ± 0.26 to 3.63 ± 0.25 mm (p-value < 0.001) after exposure. For keratometry values, results were insignificant. Conclusion. A notable improvement in VA was found on exposure to red light in young myopic patients and significant reduction in AL, SER and ACD was observed.