Axial length as a possible predictive parameter for the axial radius of anterior scleral curvature

Session Details

Session Title: Imaging Anterior Segment

Session Date/Time: Monday 07/09/2015 | 14:30-16:30

Paper Time: 15:42

Venue: Room 11

First Author: : S.Lee SOUTH KOREA

Co Author(s): :    H. Choi   H. Choi   H. Kim   M. Kim   W. Wee        

Abstract Details

Purpose:

To evaluate the correlation of the axial radius of curvature (ARC) of the anterior sclera with other ocular parameters, which can be easily obtained by the conventional devices, to find possible predictive factors.

Setting:

Department of Ophthalmology, Seoul National University College of Medicine, Seoul, Department of Ophthalmology, Hallym University Sacred Heart Hospital, Hallym University College of Medicine, Anyang, Republic of Korea.

Methods:

Three horizontal cross-sectional ocular images, which centered on visual axis, temporal limbus, and nasal limbus, were obtained from the right eyes of twenty-two volunteers using anterior segment optical coherence tomography (Visante). The images were merged using ImageJ with MosaicJ plugin semi-automatically for each eye and the ARC of cornea and sclera were calculated mathematically after curve fitting with 8th degree polynomial using MATLAB® software. The ARC of sclera at 8 mm from the visual axis (ARC8) were used for the correlation analysis with ocular parameters measured by slit-scanning corneal topography (Orbscan II) and partial coherence laser interferometry (IOLMaster).

Results:

The mean ARC8 of the nasal sclera (13.7 ± 0.5 mm) was significantly greater than that of temporal sclera (11.7 ± 0.6 mm, paired samples t test, p < 0.001). Among the ocular parameters including corneal curvature, corneal diameter, thinnest corneal thickness, anterior chamber depth, and axial length, only axial length showed significant correlation with the average values of the nasal and temporal ARC8 (Pearson correlation coefficient, r = 0.664, p=0.001).

Conclusions:

Axial length can be a useful tool to predict the ARC of anterior sclera, which is difficult to measure but is important for the haptic design of scleral contact lens and the suction rings for refractive surgery.

Financial Interest:

NONE