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Purpose : To analyze biometric parameters and the patterns of corneal astigmatism using partial coherence interferometry in Northern United Arab Emirates (UAE)
Methods : Axial length (AL), keratometry values, anterior chamber depth (ACD) and horizontal corneal diameter (white to white, WTW) were optically measured before cataract surgery between 2015 and 2018 by partial coherence interferometry (Aladdin) at the Sheikh Khalifa Specialty Hospital in UAE. Corneal astigmatism result was compared with studies in Europe, Korea and China.
Results : The study evaluated 216 eyes of 112 cataract patients (mean age 67.2 ± 9.42 years; range 20 to 89 years); 54% of the patients were men. The mean AL, ACD, WTW were 23.20 ± 1.00 mm; range 20.90 to 27.92 mm, 3.05 ± 0.35 mm; range 1.21 to 4.33 mm and 11.15 ± 0.49 mm; range 9.19 to 12.37 mm, respectively. The average flat and steep keratometry value were 43.81 ± 1.87 Diopters (D) and 45.10 ± 1.89 D, respectively. Mean corneal astigmatism was 1.28 ± 0.95 D. Corneal astigmatism less than 1.00 D was 44.9%, 1.00 – 2.00 D 37.5% and greater than 2.00D 17.1%. With the rule astigmatism was in 59.6% of eyes, against the rule in 27.9% and oblique in 12.5%. There was tendency of higher corneal astigmatism in Northern UAE than those in Europe (0.90D) , Korea (1.07 D) and China (1.01 D to 1.15D, various reports).
Conclusion : The profile in this analysis can provide normative data for cataract surgery and a useful reference in Northern UAE, Middle East. This study showed higher corneal astigmatism in Norther UAE than those in Europe and Far East.
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