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  • Title: Refraction and aberration across the horizontal central 10 degrees of the visual field.
    Author: Atchison DA, Lucas SD, Ashman R, Huynh MA, Schilt DW, Ngo PQ.
    Journal: Optom Vis Sci; 2006 Apr; 83(4):213-21. PubMed ID: 16614576.
    Abstract:
    PURPOSE: The purpose of this study was to measure refraction and aberrations across the horizontal central visual field. METHODS: Cycloplegic refraction was measured on eight subjects at 13 points across the horizontal central 10 degrees of the retina using a Hartmann-Shack wavefront sensor. Refractions were converted into mean sphere (M), 90 degrees to 180 degrees astigmatism (J180), and 45 degrees to 135 degrees astigmatism (J45) components. For five subjects, higher-order aberrations were determined at the center and edges of the field. RESULTS: Subtle changes in refraction were found to exist across the central 10 degrees of the retina, with changes in mean best sphere varying by up to half a diopter across this region and with smaller changes in astigmatism. Horizontal coma, but no other higher-order aberrations, varied systemically across the visual field; it varied linearly with angle but at different rates for the different subjects. CONCLUSION: Subtle changes in cycloplegic refraction exist across the horizontal central 10 degrees of the retina. The results indicate the need for correct alignment when measuring objective refraction.
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