Measuring peripheral wavefront aberrations in subjects with large central visual field loss
Introduction: In a previous study we have shown that correction of peripheral refractive errors can improve the remaining vision in the preferred retinal location (PRL) of subjects with large central ...
Simulated retinal images of Landolt rings in human eyes including asymmetric aberrations on the point spread function analysis system
To simulate the retinal images of the human eye including asymmetric aberrations is very important and interesting with using a new point spread function analysis system (PSFAS). The point light sourc...
Using wavefront measurements to predict visual acuity
Proc. SPIE, Vol. 5314, 220 (2004);
doi:10.1117/12.529588
Online Publication Date: 22 July 2004
Conference Date: Saturday 24 January 2004
Conference Location: San Jose, CA, USA
Conference Title: Ophthalmic Technologies XIV
Conference Chairs: Fabrice Manns, Per G. Soderberg, Arthur Ho
The traditionalmeans of measuring visual acuity in human eyes relies oneye charts and the patient's perceptions. With the advent ofwavefront-based technologies, it is now feasible to objectively determine opticalresolution. This paper proposes a technique using a resolution spoketo accurately predict visual acuity based on wavefront measurements. Resolutionrings are constructed using Rayleigh's criterion for the determination ofoptical acuity; subsequent cross correlation of the blurred resolution spokewith the un-blurred spoke is used to estimate decentration ofthe PSF. After laser refractive surgery, the visual acuity of11 eyes (formerly myopic) was estimated using this technique. Thepredicted visual acuity was compared to the corresponding subjective measurementsusing 100% contrast. The correlation variance between predicted and measuredacuity was about 74%, which shows that the optical acuityof human eyes can be measured objectively.
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