Forward light scatter analysis of the eye in a spatially-resolved double-pass optical system.
Bottom Line: An optical analysis is developed to separate forward light scatter of the human eye from the conventional wavefront aberrations in a double pass optical system.We prove an additivity property for radial variance that allows us to distinguish between spot blurs from macro-aberrations and micro-aberrations.When the method is applied to tear break-up in the human eye, we find that micro-aberrations in the second pass accounts for about 87% of the double pass image blur in the Shack-Hartmann wavefront aberrometer under our experimental conditions.
Affiliation: School of Optometry, Indiana University, 800 Atwater Avenue, Bloomington, Indiana 47405, USA. firstname.lastname@example.orgShow MeSH
Related in: MedlinePlus
Mentions: The raw image of the SH spots encircled with a pupil of radius 3 mm. The diameter of each lenslet is 400 microns in the SH detector. We expect a 15x15 array of the spot images inside the pupil. The ' + ' sign indicates the pupil center, which does not necessarily coincide with a spot in a lenslet. The intensity of the raw images was boosted for the display purpose. (a) the baseline data when the tear film forms a smooth surface (soon after ablink), (b) the SH image after the tear break-up (following blink-suppression).
Affiliation: School of Optometry, Indiana University, 800 Atwater Avenue, Bloomington, Indiana 47405, USA. email@example.com