Differences between wavefront and subjective refraction for infrared light.

Purpose: To determine the accuracy of objective wavefront refractions for predicting subjective refractions for monochromatic infrared light.

Methods: Objective refractions were obtained with a commercial wavefront aberrometer (COAS, Wavefront Sciences). Subjective refractions were obtained for 30 subjects with a speckle optometer validated against objective Zernike wavefront refractions on a physical model eye (Teel et al.

Design and validation of an infrared Badal optometer for laser speckle.

Purpose: To validate the design of an infrared wavefront aberrometer with a Badal optometer employing the principle of laser speckle generated by a spinning disk and infrared light. The instrument was designed for subjective meridional refraction in infrared light by human patients.

Methods: Validation employed a model eye with known refractive error determined with an objective infrared wavefront aberrometer.

Longitudinal chromatic aberration of the human infant eye.

Although the longitudinal chromatic aberration (LCA) of the adult eye has been studied, there are no data collected from the human infant eye. A chromatic retinoscope was used to measure cyclopleged infant and adult refractions with four pseudomonochromatic sources (centered at 472, 538, 589, and 652 nm) and with polychromatic light. The LCA of the infant eyes between 472 and 652 nm was a factor of 1.