Abstract
Background: Anterior chamber angle (ACA) can be measured by many different techniques. In order for a technique to be a part of the routine eye examination, it has to be quick and easy in good agreement with gonioscopy both nasally and temporally. Aim: To investigate variation in ACA measurement between gonioscopy, van Herick technique, anterior segment optical coherence tomography (AS-OCT) and Sirius Scheimpflug-Camera both nasally and temporally. Method: The ACA of 50 eyes of 25 healthy subjects was measured with gonioscopy, van Herick technique, AS-OCT and Sirius Scheimpflug-Camera. The angle was measured both nasally and temporally. Results: No statistically significant difference could be found between gonioscopy, van Herick technique and AS-OCT either nasally or temporally. The Sirius Scheimpflug-Camera on the other hand showed statistically significant difference to gonioscopy (p Conclusion: This study showed good agreement between three of the four techniques. ACA measurements obtained by the Sirius Scheimpflug-Camera should therefore not be considered interchangeable with those obtained by the remaining three methods.
Highlights
Angle Closure Glaucoma (ACG), a sight threatening eye disease, is a major cause of blindness throughout the world [1].ACG is caused by the abnormal positioning of the peripheral iris towards the trabecular meshwork which hinders the aqueous outflow resulting in an increased intraocular pressure (IOP), eventually leading to glaucomatous optic neuropathy and irreversible blindness [2,3,4].Eyes with narrow angles and at risk of ACG can be prevented from the disease if they are identified prior to the disease’s onset [5]
Anterior chamber angle (ACA) can be measured by many different methods: e.g. gonioscopy, ultra sound biomicroscopy (UBM), van Herick technique, Scheimpflug photography, anterior segment optical coherence tomography (AS-OCT) and the Sirius Scheimpflug-Camera [1]
The ACA measurement obtained with van Herick technique and gonioscopy was carried out by an experienced optometrist masked to the test results obtained by the Sirius Scheimpflug-Camera and the AS-OCT
Summary
Angle Closure Glaucoma (ACG), a sight threatening eye disease, is a major cause of blindness throughout the world [1]. It is very important to measure and evaluate the anterior chamber angle (ACA), Figure 1, of all the patients in a routine eye examination. Evaluation of ACA should be performed at patients who take medication that can cause pupil dilation [7]. For ACA evaluation in a routine eye examination, a quick and easy method is needed. ACA can be measured by many different methods: e.g. gonioscopy, ultra sound biomicroscopy (UBM), van Herick technique, Scheimpflug photography, anterior segment optical coherence tomography (AS-OCT) and the Sirius Scheimpflug-Camera [1]
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