By Universitat Politècnica de Catalunya. Departament d'Òptica i Optometria; Vilaseca Ricart, Meritxell; Díaz-Doutón, Fernando; Luque, Sergio Oscar; Aldaba Arévalo, Mikel; Arjona Carbonell, Mª Montserrat; Pujol Ramo, Jaume
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Extra resources for Optics of astigmatism and retinal image quality
2 Visual quality The optical performance of the eye is related to a few interconnected terms: the point-spread function (PSF), Strehl ratio, and retinal-image spot radius (Miháltz et al 2011). The PSF of an optical system is the irradiance distribution of light from a point source projected onto the retina; it indicates the extent of blurring of the retinal image. The Strehl ratio is the ratio of the peak height of the PSF divided by maximum intensity of PSF in the diffraction-limited perfect eye.
To this list one must add laser in situ keratomileusis (LASIK) as an iatrogenic cause of a keratoectatic disorder. All these disorders are associated with regular and irregular astigmatism, ranging from low magnitude to many diopters. 2 Post corneal surgery The cornea is a physical structure under internal pressure. Surgical intervention in the physical integrity of the cornea, intended or unintended, is a possible cause of change of shape and optical properties. The cornea is subject to many forms of surgery, and induced astigmatism evolves in many of the patients.
An ideal optical system with no aberrations would produce a flat wavefront. Any aberration would distort the shape of the wavefront. There are different methods to measure the wavefront. In Hartmann-Shack aberrometry a single spot of light is lit on the retina, and the wavefront of the exiting light is calculated. This method is considered outgoing aberrometry. In Tscherning aberrometry the ingoing light passes through a mask of holes before entering the eye. The resultant array of spots on the retina is captured with a high-magnification camera, and the wavefront of the entering light is calculated.
Optics of astigmatism and retinal image quality by Universitat Politècnica de Catalunya. Departament d'Òptica i Optometria; Vilaseca Ricart, Meritxell; Díaz-Doutón, Fernando; Luque, Sergio Oscar; Aldaba Arévalo, Mikel; Arjona Carbonell, Mª Montserrat; Pujol Ramo, Jaume