Free Papers

Analysis of angle-to-angle and spur-to-spur distances using high-resolution swept source optical coherence tomography

Free Paper Details

First Author: R.Montes-Mico SPAIN

Co Author(s):    P. Tañá-Rivero   S. Aguilar-Córcoles   R. Ruíz-Mesa   M. Ruíz-Santos   M. Rodríguez-Carrillo        

Abstract Details

Purpose:

To measure angle-to-angle (ATA) and spur-to-spur (STS) distances in 6 meridians using high-resolution swept-source optical coherence tomography (SS-OCT) and to compare with horizontal white-to-white (WTW) distance.

Setting:

Oftalvist Clinic, Alicante, Spain.

Methods:

68-eyes of 68-patients participated in this study. All eyes were measured with the Anterion SS-OCT (Heidelberg, Germany) using a 1300-nm light source. ATA was define as the distance between two anterior chamber angles in one B-scan, measured from angle recess point to angle recess point, and STS as the distance between one scleral spur to the other scleral spur within one B-scan. These distances were measured in 6 cross-sectional images corresponding to the vertical (inferior-superior, 6-12-o’clock), 1-7-o’clock, 2-8-o’clock, horizontal (nasal-temporal, 3-9-o’clock), 4-10-o’clock and 5-11-o’clock meridians. WTW was measured only horizontally with the infrared camera.

Results:

Largest values were found for the vertical meridian and shortest for the 2-8-o’clock meridian both for ATA and STS. The difference between these two meridians was 0.5-mm and 0.46-mm, for ATA and STA, respectively. No significant differences were found between WTW, ATA and STS horizontally (p>0.1). A comparison between ATA and STS showed significant differences except for the horizontal and 2-8-o’clock meridians (p>0.05). ATA and STS analysis as a function of the meridians compared showed significant differences for all comparisons except for ATA at 4-10 versus 3-9-o’clock and for STS at 4-10 versus 3-9-o’clock and at 3-9 versus 2-8-o’clock (p>0.1).

Conclusions:

ATA and STS distances varied radially showing that the anterior chamber is vertically oval. These two distances should be considered instead of WTW for phakic intraocular lens sizing.

Financial Disclosure:

-