In order to determine the power of intraocular lens several values need to be known eyes axial length al corneal power k postoperative iol position within the eye known as estimated lens position elp the anterior chamber constant a constant or another lens related constant. Here the iol power is chosen as the variable which is calculated on the basis of this equation and its derivatives p 1336 al elp 1336 1336 1000 1000 dpostrx v k elp. Intraocular lens iol power calculation is a process to determine the optimal iol power to achieve the desired refraction following cataract surgery. Intraocular lens power calculations over the last decade iol power calculations have become a focal point of cataract surgery in 1977 the state of the art for estimating iol power for emmetropia was to simply add 190 d to the pre cataractous refraction
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