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Control of the myopic shift in modified Badal optometer
Author(s) -
Kȩdzia Bolesław,
Twardowski Piotr
Publication year - 1998
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 - 10.1046/j.1475-1313.1998.97000604.x
Subject(s) - refractive error , zoom lens , optics , lens (geology) , zoom , optometry , point (geometry) , artificial intelligence , computer science , computer vision , physics , mathematics , visual acuity , medicine , geometry
Summary Refractive error measurements made with the Badal optometer typically register more myopia than is actually present. In this paper we measured the influence of the image size on the end‐point of a Badal optometer's refractive error measurement. The optometer was modified with a camera's zoom lens in such a way that the retinal image size could be controlled. It was found that retinal image size is a major factor in controlling the subjective endpoint. When retinal image size is diminished rather than increased as the target approaches the subject, as is the case under normal circumstances, the perceived endpoint more closely agrees with the actual refractive error.