الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Cataract surgery is one of the most common procedures performed worldwide. It is also one of the oldest. Alongside advancements in cataract surgical techniques have been improvements in intraocular lens implantation technology. It has progressed from a basic treatment of removing the clouded crystalline lens to a process that attempts to repair all refractive faults, allowing for a complete restoration of visual function and high degrees of spectacle independence.
Astigmatism is a meridian-dependent error of refraction that affects the majority of people’s eyes. According to certain research, 30 percent, 22 percent, and 8% of cataract patients had corneal astigmatism of greater than 0.75 diopters (D), 1.50 D, and 2.00 D, respectively.
Accurate measurement of total corneal astigmatism is a critical element in correcting astigmatism during cataract surgery.
Toric intraocular lenses (IOLs) offer patients the opportunity to correct corneal astigmatism at the time of cataract surgery and achieve spectacle independence for distance vision. The recently introduced multifocal toric IOLs offer the opportunity to achieve spectacle independence not only for distance vision but also for near and intermediate vision.
Before cataract surgery, ocular biometric measures are critical for calculating intraocular lens (IOL) power. Optical biometry has been shown to be more accurate and safe than ultrasonic biometry, which is associated with the danger of infection and indentation as a result of contact measurement.
The aim of our study was to compare the standard keratometry to total keratometry in toric intraocular lens calculation by a swept source optical coherence tomography biometer.
The study was conducted as a prospective interventional study, which included 30 eyes of 30 patients who underwent uneventful phacoemulsifation surgery with implantation of toric IOL by same surgeon.
IOLmaster 700, Carl Zeiss Meditec, Inc, Dublin, CA, USA, was used implementing both standard keratometry and total keratometry values in each patient, on the same visit, to measure different parameters and calculate the toric intraocular lens (IOL) power using the Barrett formula.
The IOLmaster 700 biometry was then used to assign all patients to IOL implantation in a sequential order. After surgery, there was a one-month follow-up period.
The demographic characteristics of the study patients revealed a slight female preponderance (12 (40%) males and 18 (60%) females). The mean (standard deviation) age of the study patients was 68.4± 7.5 and ranged from 53– 85 years of age.
The mean (standard deviation) preoperative uncorrected and best-corrected visual acuity of the study patients were 0.16 ± 0.1 and 0.37 ± 0.2 respectively (p-value < 0.0001). The mean (standard deviation) preoperative refraction (sphere, cylinder, axis and spherical equivalent) of the study patients was –1.25 ± 2.4, –2.43 ± 0.8, 94.6 ± 37.3and -2.56±2.4 respectively.