الفهرس 
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Abstract
Summary:
This study aimed at comparing between accuracy of optical and ultrasonic biometry in IOL calculation in high myopic cataractous patients to achieve the desired postoperative refraction measured one month after surgery
50 patients with simple cataract not associated with other pathologies suitable for phacoemulsification and 1ry IOL implantation With AL equal to or greater than 26.5mm were included. They were divided into 2 groups, group (1) was measured by optical biometry and group (2) by ultrasonic biometry
All patients were subjected to detailed ophthalmological evaluation including: Detailed ophthalmological history (complaint, history of previous ocular surgeries, ocular trauma or any ocular medications) and medical history, Visual acuity assessment: un and best correct visual acuity using Landolt C chart, Slit lamp examination for assessment of the anterior segment and cataract grading, Intraocular pressure (IOP) measurement, Dilated fundus examination, Preoperative investigations including: biometry and B scan
Postoperative follow up included: slit lamp biomicroscope examination and postoperative refraction being measured 1 month postoperatively
Results revealed that AL measured by optical biometry was 0.18±0.27(-0.38:0.75) mm, longer than that of A-scan and was statistically significant (P < 0.001) whereas other parameters: k readings, ACD, were nearly comparable in both groups [P>0.05]
As regard the postoperative results, although the difference was not statistically significant, yet, better refractive outcomes can still be noticed with optical biometry with the use of Haigis formula
Conclusion:
The results of this study showed that optical biometry provide more precise measurements of biometric parameters, especially AL than applanation ultrasonic biometric in highly myopic patients
These findings together with the advantages of being easy, simple, non-contact method making optical biometry superior to ultrasonic one in IOL power prediction and therefore better refractive outcome in cataract surgery in highly myopic eyes.
Haigis formula is also preferred with high myopia, providing acceptable postoperative refractive outcomes with both methods
Yet, ultrasonic biometry is still donated in case of dense media and poor fixation.