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Validation of aberrometry‐based relative peripheral refraction measurements
Author(s) -
Berntsen David A.,
Mutti Donald O.,
Zadnik Karla
Publication year - 2008
Publication title -
ophthalmic and physiological optics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.147
H-Index - 66
eISSN - 1475-1313
pISSN - 0275-5408
DOI - 10.1111/j.1475-1313.2007.00535.x
Subject(s) - autorefractor , refractive error , refraction , cycloplegia , ophthalmology , mathematics , optometry , optics , medicine , physics , eye disease
Purpose: To validate aberrometry‐based relative peripheral refraction (RPR) measurements and to examine RPR differences in the nasal and temporal horizontal visual field. Methods: Thirty subjects underwent cycloplegia in the right eye. Ten measurements each were made centrally, 30° nasally on the retina and 30° temporally on the retina using the Complete Ophthalmic Analysis System (COAS) aberrometer and the Grand Seiko WR‐5100K autorefractor in random order. A 2‐mm COAS analysis diameter was used to approximate the Grand Seiko autorefractor measurement beam diameter. Nasal and temporal RPR were calculated as the difference between the average nasal or temporal spherical equivalent and the average central spherical equivalent. Repeated measures ANOVAs were used to test for significant differences between the RPR readings of each instrument in each retinal location (nasal or temporal) and to examine refractive error in each direction of gaze for both instruments. Results: Central spherical equivalent refractive error as measured by the Grand Seiko autorefractor ranged from +0.63 D to −8.41 D (mean ± S.D. = −2.63 D ± 2.05 D). There were no significant differences between the instruments for RPR measurements ( p = 0.34). The nasal RPR was significantly more hyperopic than the temporal RPR (mean ± S.D. = +0.45 D ± 1.04 D, p = 0.02). Spherical equivalent refractive error in all directions of gaze was more myopic with the COAS than with the Grand Seiko autorefractor (mean ± S.D. = −0.41 D ± 0.61 D, p < 0.0001). Conclusions: RPR measurements with the COAS are feasible and equivalent to those made with the Grand Seiko autorefractor. The COAS can be used to simultaneously collect RPR and peripheral aberration data. Nasal and temporal RPR measurements were significantly different in our sample.