Central foveal distribution based on posterior scleral morphologies in high myopia

Abstract

AIM: To describe the distribution of the central fovea macula in different zones of the eye fundus and different posterior scleral morphologies in high myopia(HM).METHODS: From May 2016 and February 2018, a total of 207 eyes(126 cases)with HM were selected and divided into three groups according to Curtin's posterior scleral staphyloma classifications: group A(Types Ⅰ and Ⅱ), group B(Type Ⅲ), and group C(Types Ⅶ, Ⅸ, and Ⅹ). The posterior zone of the fundus was divided into three zones: zones 1, 2 and 3. The horizontal distance between the central fovea and the vertical line pass of the optic nerve head(ONH)center(HDFCO), the vertical distance between the fovea and the horizontal line pass of the ONH center(VDFCO), and vision were tested. The fovea position in different posterior scleral morphologies groups were investigated.RESULTS: In zone 1, 3 eyes were all from group A(1.5%). In zone 2, 117 eyes were from group A(56.5%), 15 eyes were from group B(7.2%), and 13 eyes were from group C(6.3%). The HDFCO was 5 037±507 μm, 4 771±509 μm, and 5 585±773 μm in groups A, B, and C, respectively(F=8.38, P<0.01). The VDFCO values were 615±297 μm, 643±322 μm, and 504±363 μm(F=0.87, P=0.41). In zone 3, 43 eyes were from group A(20.7%), 7 eyes were from group B(3.4%), and 9 eyes were from group C(4.4%). The HDFCO was 5 048±683 μm, 4 444±540 μm, and 5 293±840 μm in groups A, B, and C, respectively(F=3.13, P=0.05). The VDFCO values were 1 385±484 μm, 1 225±201 μm, and 1 664±318 μm(F=2.18, P=0.12). The mean best corrected visual acuity of HM group was LogMAR 4.87±0.22 and 4.77±0.27 in zone 2 and zone 3, respectively(t=-1.55, P=0.12).CONCLUSION: The position of the central fovea changes slightly with different posterior scleral morphologies in HM and has no effects on best corrected visual acuity.

Keywords

• high myopia
• posterior scleral morphology
• central fovea
• vision