Posters

Assessing the changes in anterior chamber diameter and angle following standard cataract surgery using Scheimpflug tomography

Poster Details

First Author: V.Juniat UK

Co Author(s):    M. Dimitry   M. Nanavaty                 

Abstract Details

Purpose:

To assess the change in anterior chamber diameter (ACD) at 4 different meridians (0-180°, 45-225°, 90-270°, 135-315°) and angle (ACA) at 8 different points (0°, 45°, 90°, 135°, 180°, 225°, 270° and 315°) following standard cataract surgery with intraocular lens (IOL) implantation.

Setting:

Patients were selected from an ongoing prospective randomised, controlled study (UKCRN ID: 16848). Patients underwent limbal relaxing incisions or toric intraocular lens implantation for astigmatic correction combined with cataract surgery.

Methods:

Forty-nine patients (49 eyes) underwent Scheimpflug tomography pre and one month post-operatively. Each eye had up to 3 scans to obtain the best scan. Data on age, axial length, ACD (at 0-180°, 45-225°, 90-270°, 135-315°), ACA (at 0°, 45°, 90°, 135°, 180°, 225°, 270° and 315°) and anterior chamber depth were collected pre and one month post-operatively.

Results:

The mean age and axial length were 74.4±10.5 years and 23.6±1.3 mm respectively. Central anterior chamber depth increased from 2.56±0.49mm to 3.68±0.57mm (P⟨0.05). There was significant difference in ACD in all four meridians (P⟨0.01) with the maximum difference of 0.97µ at 90-270° and the least difference of 0.35µ at 0-180°. ACA changed significantly at 0°, 45°, 135°, 180°, 225°, 270° and 315° (11.7°, 5.8°, 5.9°, 7.8°, 11.7°, 8.5° and 8.2° respectively, P⟨0.05) except at 90° where the change was only 3.3° (P=0.20).

Conclusions:

Following standard cataract surgery, ACD changes more in vertical and least in horizontal meridians. ACA increases more inferiorly compared to superiorly. Devices placed in the superior anterior chamber (e.g. anterior chamber lens haptic, glaucoma tube shunts, etc) are more proximal to corneal endothelium risking faster corneal decompensation.

Financial Disclosure:

One or more of the authors research is funded, fully or partially, by a company producing, developing or supplying the product or procedure presented, One or more of the authors travel has been funded, fully or partially, by a company producing, developing or supplying the product or procedure presented