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       XXIII Annual Congress of the Iranian Society of Ophthalmology        بـیــست و سومین کنــگــره سـالیـانه انـجـمـن چـشـم پـزشـکی ایـــران
مقاله Abstract


Title: Anterior and Posterior Corneal Curvature: Normal Values in Healthy Iranian Population Obtained with the Orbscan II
Author(s): Hamid Gharaee MD ; Mojtaba Abrishami MD ; Omid Fakhrizadeh MD
Presentation Type: Oral
Subject: Cornea and Anterior Segment
Others:
Presenting Author:
Name: Mojtaba Abrishami
Affiliation :(optional) Al-Zahra Eye Center, Zahedan University of Medical Sciences, Zahedan, Iran
E mail: mojtaba_abrishami@yahoo.com
Phone: 05118433192
Mobile: 09155207987
Purpose:

The objective of study was to determine the normative values of anterior and posterior best fit sphere (A-BFS and P-BFS) measured with Orbscan II Topography System.

Methods:

A total of 1001 healthy participants aged 18-45 years participated in this observational cross-sectional study. The study population consisted of 616 female and 385 male subjects. The A-BFS and P-BFS were measured with the Orbscan II. The differences between genders, between right and left eyes and age-related changes were evaluated. Statistical analyses were performed using student t test.

Results:

The average A-BFS in our study population was recorded as 43.062±1.609D (median: 43.00D, mode: 43.80D, minimum: 34.80D and maximum: 35.80D). The A-BFS was 43.231±1.473D in males and 42.793±1.774D in females which was statistically different between genders (P<0.001). The average P-BFS in our study population was recorded as 52.698±2.395 D (median: 52.60 D, mode: 53.10 D, minimum: 34.80D and maximum: 64.50D). The P-BFS was 52.892±2.227D in males and 52.387±2.617D in females which was statistically different between genders (P<0.001). However, A-BFS and P-BFS were not statistically different between right and left eyes (p=0.523 and p=0.339 respectively). In addition, A-BFS and P-BFS were not correlated with the age (r=0.021, p= 0.342 and r=0.178 respectively). Considering 95% confidence interval, A-BFS less than 40.60D and greater than 45.40D and P-BFS less than 49.20D and greater than 56.40D would be considered abnormal.

Conclusion:

Detailed description and analysis of A-BFS and P-BFS with Orbscan demonstrated that the obtained average value BFS were higher in male than female and not changed with increasing age.

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