Comparative Validation of MOPTIM MRT-200 Refraction Device with 2WIN and Retinomax.

Background: Portable sphero-cylinder refraction is useful for remote medical missions and self-checking. A novel, inexpensive, handheld optical scope with an internal vision chart and adjustable diopter lens, called the Moptim MRT-200, was therefore validated.

Methods: Young, capable patients from a pediatric eye practice had dry refraction estimates with the Moptim MRT-200, Adaptica 2WIN photoscreener, and Monocular Retinomax compared with actual refined retinoscopy. Vector-converted sphero-cylinder refractions and the univariate ABCD Ellipsoid were used for comparison as well as monocular visual acuity.

Results: 206 racially diverse, high-risk refractive patients with median "Ellipsoid-Gap" of 3.5 had high correlation spherical equivalent and similar ABCD Ellipsoid comparing Moptim MRT-200, 2WIN and Retinomax (Kruskal Wallis X²(5) = 4.2, p = 0.52) however the 61 patients with blur associated with Ellipsoid gap over 5.0 had better refractive accuracy with 2WIN and Retinomax than Moptim MRT-200 (p < 0.001). Visual acuity with Moptim MRT-200 had a weak correlation (ICC.41 AND.47) and a Bland-Altman mean difference of approximately 1 logMAR line less fine than the actual phoropter refraction.

Conclusion: Precise sphero-cylinder estimation with the Moptim MRT-200 was too complex for lay screeners and many young patients, especially compared to 2WIN and Retinomax; however, rapid estimation of spherical refraction was feasible and valid.