Comparison of self-refraction using EyeQue Insight and EyeQue Personal Vision Tracker (PVT) with manifest refraction in adult Ghanaian Sample

Abstract

Purpose : EyeQue Insight and EyeQue Personal Vision Tracker (PVT) are handheld, low-cost, and simple-to-use devices that could enhance the standard of ophthalmic care by allowing users to perform self-administered measurements. However, these devices agreement with clinical measurements is poorly understood. The study evaluated the agreement of EyeQue Insight and EyeQue PVT compared to manifest refraction by an expert in assessing vision outcomes in an adult Ghanaian sample.

Methods : Seventy-two participants aged ranging 19-26 years with either a monocular best-corrected visual acuity (BCVA) of ≥ 6/7.5, spherical equivalent between -10.00 and +8.00D, astigmatism within the range of 0.00D to -5.00D were recruited from the Department of Optometry and Visual Science at the Kwame Nkrumah University of Science and Technology in Ghana. Exclusion criteria were known ocular pathology, speech, or hearing impairment. BCVA were assessed by an optometrist using LogMAR Early Treatment Diabetic Retinopathy Study (ETDRS) chart. The agreement between vision measures from both procedures was explored using pairwise t-test and Bland–Altman statistics.

Results : There was a small mean difference in monocular (OD: -0.03 ± 0.13 log units, p = 0.10 and OS: -0.03 ± 0.11 log units, p = 0.06) and binocular (-0.02 ±0.09 log units, p = 0.051) visual acuities by EyeQue Insight and ETDRS LogMAR chart. However, the mean difference in spherical equivalent refractive errors (OD: +1.55D ±1.56, p<0.01and OS: +1.74D ±1.83, p<0.01) by self-refraction and subjective refraction was statistically significant and clinically important.

Conclusions : In clinical applications, the measurements obtained with EyeQue Insight corroborate well with ETDRS LogMAR visual acuity measures. However, the results of the EyeQue PVT were less reliable than subjective refraction in refractive correction. Programs targeting resource-constrained settings could potentially use EyeQue Insights to provide an easy on-site self-testing and/or visual acuity assessment.

This abstract was presented at the 2023 ARVO Annual Meeting, held in New Orleans, LA, April 23-27, 2023.