文摘

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. In this cross-sectional study, patients (age range: 18-0?years) referred to the Khatam Eye Hospital (Mashhad, Iran) were put in an observational cross-sectional study. 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. A total of 977 healthy participants consisted of 614 female and 363 male subjects aged 18-5?years participated. The average A-BFS in our study population was recorded as 43.060?±?1.541?D (median: 43.00?D, mode: 43.10?D, range: 38.80-5.80?D). The average P-BFS in our study population was recorded as 52.702?±?2.190?D (median: 52.60?D, mode: 53.10?D range: 46.9-2.20?D). The A-BFS and P-BFS were respectively 42.753?±?1.629 and 52.327?±?2.376?D in males and 43.242?±?1.457 and 52.924?±?2.041?D in females, which were statistically different between the genders (P?P?=?0.649 and P?=?0.688 respectively). In addition, A-BFS and P-BFS were not correlated with the age (r?=?0.038, P?=?0.096 and r?=??.142, P?=?0.178 respectively). Considering 95?% confidence interval, A-BFS less than 43.13?D and greater than 42.99?D and P-BFS less than 52.80?D and greater than 52.60?D would be considered abnormal. Detailed description and analysis of A-BFS and P-BFS with Orbscan demonstrated that the obtained average value of BFS were higher in male than female and did not change with increasing age.