The BHVI-EyeMapper: Peripheral Refraction and Aberration Profiles

Purpose. The aim of this article was to present the optical design of a new instrument (BHVI-EyeMapper, EM), which is dedicated to rapid peripheral wavefront measurements across the visual field for distance and near, and to compare the peripheral refraction and higher-order aberration profiles obtained in myopic eyes with and without accommodation. Methods. Central and peripheral refractive errors (M, J180, and J45) and higher-order aberrations (C[3, 1], C[3, 3], and C[4, 0]) weremeasured in 26myopic participants (mean [TSD] age, 20.9 [T2.0] years;mean [TSD] spherical equivalent,j3.00 [T0.90] diopters [D]) corrected for distance. Measurements were performed along the horizontal visual field with (j2.00 toj5.00 D) and without (+1.00 D fogging) accommodation. Changes as a function of accommodation were compared using tilt and curvature coefficients of peripheral refraction and aberration profiles. Results. As accommodation increased, the relative peripheral refraction profiles ofM and J180 became significantly (p G 0.05) more negative and the profile ofM became significantly (p G 0.05) more asymmetric. No significant differences were found for the J45 profiles (p 9 0.05). The peripheral aberration profiles of C[3, 1], C[3, 3], and C[4, 0] became significantly (p G 0.05) less asymmetric as accommodation increased, but no differences were found in the curvature. Conclusions. The current study showed that significant changes in peripheral refraction and higher-order aberration profiles occurred during accommodation in myopic eyes. With its extended measurement capabilities, that is, permitting rapid peripheral refraction and higher-order aberration measurements up to visual field angles of T50 degrees for distance and near (up toj5.00 D), the EM is a new advanced instrument that may provide additional insights in the ongoing quest to understand and monitor myopia development. (Optom Vis Sci 2014;91:1199Y1207) Key Words: peripheral refraction, aberrations, instrumentation, myopia, accommodatio