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| Conference | 2022 NASA Human Research Program Investigator´s WorkShop (Online Conference) |
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INTRODUCTION Hyperopic refractive error shift along with optic disc edema, choroidal folds, nerve fiber layer infarcts, globe flattening are referred to as spaceflight-associated neuro-ocular syndrome (SANS) [1][2]. Although the observed hyperopic shift can be corrected with eyeglasses, the time course of all these visual changes in microgravity is not well elucidated, due to the need for an accurate, precise, and easy-to-use instrument. Ophthalmic instruments that are highly repeatable such as autorefractors and optical biometers, do not meet the portability requirements for space flights [3]. Towards this need, we modified a portable handheld autorefractor (QuickSee, PlenOptika), that provides binocular objective measurements in 10 seconds, to reduce its weight and improve its form factor. This study evaluates the ability of the new prototype to accurately and repeatably assess small variations in refractive error to mimic hyperopic changes in a subject’s refractive power, and thus, its suitability as a technology for indirectly monitoring changes in axial length of the eye under microgravity conditions. |
