The classical Javal's rule allows estimation of refractive cylinder from keratometric astigmatism using scaling for vergence transformation, with an additional half dioptre against-the-rule. With increasing popularity toric intraocular lenses it has been shown that does not fully reflect the entire phakic or pseudophakic eye. Researchers mostly argue this mismatch is primarily due to corneal ba...

To study the keratometry of Indian pediatric eyes, effect speculum on reading, concordance hand held and automated unilateral bilateral cataract IOL power calculation. This was conducted as a cross- sectional observational 101 eyes children in age range 41 post-conceptional weeks to 144 months. All cooperative patients were subject followed by using keratometer with without speculum. Hand docum...

This retrospective study was performed to compare refractive outcomes measured by conventional methods and by use of the Lenstar biometer and to investigate the factors affecting intraocular lens (IOL) power calculation with Lenstar with and without IOL-constant optimization. The study included 100 eyes of 86 patients who underwent cataract surgery. Corneal curvature was measured with a manual ...

A system for supporting corneal suture for minimizing induced astigmatism, due to irregular manual stitches, has been designed. The system projects 48 light spots, from LEDs, displayed in a precise circle at the lachrymal film of the examined cornea. The displacement, the size and deformation of the reflected image of these light spots analysis providies the keratometry and the circularity of t...

RATIONALE Penetrating astigmatic keratotomy (penetrating AK) is a well-known method to correct corneal astigmatism but rarely be performed nowadays. This article reevaluated the clinical effectiveness and confounding factors of penetrating AK. PATIENT CONCERNS Penetrating AK has been introduced to serve as one alternative operation for astigmatism correction, and is thought to have the potent...