Comparative Study between Pentacam and IOL Master in Measuring Anterior Segment Parameters in Eyes of Egyptian Individuals

Abstract
Background: Accurate values of anterior segment param-eters are important for diagnosing variety of diseases and for cataract surgery, glaucoma, refractive surgery and post-operative follow-up. The true values of Anterior Chamber Depth (ACD), corneal power (K-readings) and White-to-White (WTW) are essential in calculating the Intraocular Lens power (IOL). The measurement of the ACD and WTW is essential for the success of phakic IOL implantation in patients asking for refractive surgery. This is now possible because of the development of new, accurate diagnostic and surgical tools.
Aim of Study: To compare values of anterior segment parameters (ACD, K-reading, WTW) obtained by Pentacam and IOL master to know if there are significant differences in measurement results between both devices or only minimal differences which can be neglected.
Patients and Methods: This comparative cross sectional study included 40 eyes of 22 Egyptian individuals. Evaluation included best corrected visual acuity, slit-lamp evaluation and autorefractometer reading. Imaging by investigative method in the form of IOL master 500 and Pentacam Oculus. All investigations and examinations were done at Kobri El-Kobba military Hospital, Cairo. From January 2018 to August 2018.
Results: IOL master gives statistically significant higher value of K-readings (43.56±1.72 & 45.03±1.59 for K1 & K2 respectively) than Pentacam (43.28±1.73 & 44.72±1.58 for K1 & K2 respectively). Low significant difference between both devices in values of ACD (mean difference ± SD –0.03± 0.10). Pentacam measures longer WTW value (mean 12.10± 0.45) than IOL master (mean 12.00±0.41).
Conclusion: IOL master gives slightly higher K-reading than Pentacam. Both devices measure ACD accurately and give nearly similar results. IOL master gives reliable WTW estimation but pentacam measurement of WTW by inserting calipers on scheimpflug image may give different values than IOL master.