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خانم نیلوفر طهرانچی(ASSESSING OCULAR ABERRATION WITH OPD SCAN III)

خانم نیلوفر طهرانچی(ASSESSING OCULAR ABERRATION WITH OPD SCAN III)

ASSESSING OCULAR ABERRATION WITH OPD SCAN III

 

Rehabilitation Research Center,Department of Optometry,School of Rehabilitaion Sciences,Iran University of Medical Sciences,Tehran,Iran

Abstract: Aberration is a defect in optical system in which light rays emerging from one object point fail to form on single image point and several blurry image points are formed. The wave from that forms the image is not sphere.The difference between the ideal image and the formed image is called optical aberration.examining the aberrations reveals the changes that the optical system makes to the phase of the imported light beam.As the error distance increases from zero,the blur rate of the image increses and the retinal image shape differs from the expected ideal image. There are several devices that can evaluate the amount of these optical aberrations among which the OPD Scan III has received special attention.OPD is combined with topography,refractometry,keratometry and pupillometry in a single device to overcome a number of potential problems.wave front’s analysis provides us with information about the general refractive status of the eye,including the cornea,lens,and retina.It also provides us with the aberrations that occur due to dilation.The biggest advantage of wave front technology is in the custom ablation planning,it is also useful for screening patients for refractive surgery. Wave front’s analysis helps to explain and express aberrations when they are not clear in corneal topography

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