Abstract
Purpose :
To measure intraocular pressure (IOP) elevation during standard gonioscopy, selective laser trabeculoplasty (SLT), and laser iridotomy.
Methods :
Cadaver eyes (n=12) were mounted to a custom apparatus and cannulated with a pressure transducer which measured IOP. The apparatus was mounted to a load cell which measured force on the eye. Six ophthalmologists performed simulated gonioscopy (Sussman 4 mirror lens), SLT (Latina lens), and laser iridotomy (Abraham) while a computer recorded IOP (mmHg) and force (grams).
Results :
The average IOP’s for gonioscopy, SLT, and laser iridotomy were 43.2 ± 16.9 mmHg, 39.8 ± 9.9 mmHg, and 42.7 ± 12.6 mmHg, respectively. The mean forces on the eye for the Sussman, Latina, and Abraham lenses were 40.3 ± 26.4 grams, 66.7 ± 29.8 grams, and 65.5 ± 35.9 grams, respectively. The average force exerted on the eye by the Sussman lens was significantly lower than both the Latina lens (p=0.0008) and the Abraham lens (p=0.001). During gonioscopy indentation, IOP elevated on average to 80.5 ± 22.6 mmHg. During simulated laser iridotomy tamponade, IOP elevated on average to 82.3 ± 27.2 mmHg.
Conclusions :
In cadaver eyes, standard glaucoma procedures elevate IOP, on average, by about 20 mmHg above baseline.
This abstract was presented at the 2023 ARVO Annual Meeting, held in New Orleans, LA, April 23-27, 2023.