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  • Title: Lens magnification affects the estimates of refractive error obtained using eccentric infrared photorefraction.
    Author: Bharadwaj SR, Bandela PK, Nilagiri VK.
    Journal: J Opt Soc Am A Opt Image Sci Vis; 2018 Jun 01; 35(6):908-915. PubMed ID: 29877334.
    Abstract:
    Positive- and negative-powered ophthalmic lenses are used in eccentric infrared photorefraction to calibrate the device, correct the subject's baseline refractive error before an experimental manipulation, or stimulate blur-driven accommodation. Through theoretical modeling of luminance gradients formed across the pupil and empirical measurements of the eye's refractive error using a commercial photorefractor, this study shows that image magnification by positive lenses and image minification by negative lenses under- and overestimates the refractive error, respectively, all independent of image defocus. The impact of image magnification/minification therefore appears non-trivial in experimental paradigms involving ophthalmic lenses to manipulate the eye's optics during photorefraction.
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