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Comparative Validation of MOPTIM MRT-200 Refraction Device with 2WIN and Retinomax
Heidi Schumacher1,2, Giancarlo Garaygay1, Aana Ayagalria1
1Alaska Blind Child Discovery, Alaska Children's EYE & Strabismus, Anchorage, Alaska, 99508, USA.
Clinical Ophthalmology (Auckland, N.Z.)
|September 10, 2025
Summary
The Moptim MRT-200 offers valid rapid spherical refraction estimation, but precise sphero-cylinder measurements are complex for non-professionals. This portable device shows potential for remote eye exams.
Area of Science:
- Ophthalmology
- Optometry
- Medical Devices
Background:
- Portable refraction devices are valuable for remote medical missions and self-examinations.
- The Moptim MRT-200 is a novel, inexpensive, handheld optical scope designed for this purpose, featuring an internal vision chart and adjustable diopter lens.
Purpose of the Study:
- To validate the Moptim MRT-200 for portable sphero-cylinder refraction.
- To compare its accuracy against established methods like retinoscopy and other handheld devices.
Main Methods:
- Dry refraction estimates were performed on young, capable pediatric patients using the Moptim MRT-200, Adaptica 2WIN photoscreener, and Monocular Retinomax.
- Comparisons were made against refined retinoscopy using vector-converted sphero-cylinder refractions, the ABCD Ellipsoid, and monocular visual acuity.
Main Results:
- High correlation in spherical equivalent and similar ABCD Ellipsoid values were found between Moptim MRT-200, 2WIN, and Retinomax across 206 diverse, high-risk refractive patients.
- However, for patients with significant blur (Ellipsoid gap > 5.0), 2WIN and Retinomax demonstrated superior refractive accuracy compared to the Moptim MRT-200 (p < 0.001).
- Visual acuity measurements with the Moptim MRT-200 showed weak correlation and a mean difference of approximately one line less precise than phoropter refraction.
Conclusions:
- Precise sphero-cylinder estimation using the Moptim MRT-200 proved too complex for lay screeners and many young patients, particularly when compared to the 2WIN and Retinomax.
- Nevertheless, the Moptim MRT-200 is capable of rapid and valid spherical refraction estimation, making it a potentially useful tool for specific applications.
