EVALUATION OF ANTERIOR, POSTERIOR, AND TOTAL CORNEAL ASTIGMATISM IN NORMAL SUBJECTS

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DERAKHSHAN REZA; GHASSEMI BROUMAND MOHAMMAD; GHOREISHI SAYED MOHAMMAD; TABATABAEE SEYED MEHDI; MOHAMMADI NIA MOHADESEH

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Journal: JOURNAL OF ISFAHAN MEDICAL SCHOOL (I.U.M.S) Year:2017 | Volume:35 | Issue:450 Page(s): 1382-1388

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Title

EVALUATION OF ANTERIOR, POSTERIOR, AND TOTAL CORNEAL ASTIGMATISM IN NORMAL SUBJECTS

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Keywords

ASTIGMATISMQ3

REFRACTIVE ERRORQ3

EYEQ3

Abstract

Background: The aim of this study was to evaluate the magnitude and axis orientation of anterior, posterior, and total corneal ASTIGMATISM (ACA, PCA, and TCA, respectively).Methods: In this retrospective study, pentacam topographical maps of 226 EYEs (113 patients) with 1.0 to 6.0 diopters (D) of ASTIGMATISM were analyzed. Topographical anterior and posterior corneal surface ASTIGMATISM was determined. The magnitude and axis orientation of the anterior, posterior and total corneal ASTIGMATISM were compared.Findings: The mean age of the study population was 33.00±6.74 years. The mean magnitude was 2.02±0.99, 0.44±0.20, and 1.98±1.01 diopters for anterior, posterior, and total corneal ASTIGMATISM, respectively. Most EYEs had with-the-rule (WTR) anterior ASTIGMATISM and against-the-rule (ATR) posterior ASTIGMATISM. With-the-rule ASTIGMATISM had a higher mean magnitude compared to against-the-rule and oblique ASTIGMATISM in anterior and posterior corneal ASTIGMATISM groups. Posterior corneal ASTIGMATISM magnitude exceeded 0.75 diopters in only 8% of the subjects. Anterior corneal ASTIGMATISM had a significant positive correlation with posterior and total corneal ASTIGMATISM (P<0.001 for both, r=0.83 and 0.98, respectively). Moreover, posterior corneal ASTIGMATISM had a significant positive correlation with total corneal ASTIGMATISM (P<0.001, r=0.78).Conclusion: The provided information of this study may be helpful in obtaining optimum results in ASTIGMATISM correction in refractive surgery or designing new intraocular lenses.

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APA: Copy

DERAKHSHAN, REZA, GHASSEMI BROUMAND, MOHAMMAD, GHOREISHI, SAYED MOHAMMAD, TABATABAEE, SEYED MEHDI, & MOHAMMADI NIA, MOHADESEH. (2017). EVALUATION OF ANTERIOR, POSTERIOR, AND TOTAL CORNEAL ASTIGMATISM IN NORMAL SUBJECTS. JOURNAL OF ISFAHAN MEDICAL SCHOOL (I.U.M.S), 35(450 ), 1382-1388. SID. https://sid.ir/paper/49701/en

Vancouver: Copy

DERAKHSHAN REZA, GHASSEMI BROUMAND MOHAMMAD, GHOREISHI SAYED MOHAMMAD, TABATABAEE SEYED MEHDI, MOHAMMADI NIA MOHADESEH. EVALUATION OF ANTERIOR, POSTERIOR, AND TOTAL CORNEAL ASTIGMATISM IN NORMAL SUBJECTS. JOURNAL OF ISFAHAN MEDICAL SCHOOL (I.U.M.S)[Internet]. 2017;35(450 ):1382-1388. Available from: https://sid.ir/paper/49701/en

IEEE: Copy

REZA DERAKHSHAN, MOHAMMAD GHASSEMI BROUMAND, SAYED MOHAMMAD GHOREISHI, SEYED MEHDI TABATABAEE, and MOHADESEH MOHAMMADI NIA, “EVALUATION OF ANTERIOR, POSTERIOR, AND TOTAL CORNEAL ASTIGMATISM IN NORMAL SUBJECTS,” JOURNAL OF ISFAHAN MEDICAL SCHOOL (I.U.M.S), vol. 35, no. 450 , pp. 1382–1388, 2017, [Online]. Available: https://sid.ir/paper/49701/en

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