Nida Khan

Abstract

Background: The proposed new method of measuring angle of anterior chamber is an effective method of measuring the angles. Identification of narrow anterior chamber angle is important for glaucoma screening and prophylactic treatment prevents acute angle closure glaucoma event. Aim of this study wasto measure the angle of anterior chamber using Topcon spectral domain optical coherence tomography (SD OCT). Materials and Methods: In this cross-sectional study 120 normal subjects above the age of 40 years were enrolled. The study was done at the tertiary health care center of central Indian. All volunteers had visual acuity of at least 6/9 with no ocular diseases. Using OCT the angle opening distance (AOD-500), trabecular–iris angle (TIA) and trabecular-iris space area (TISA-500) were measured. Result: In this study the mean AOD was 0.430 µm in nasal and 0.433 µm in temporal quadrant. The mean TISA in nasal was 0.405 µm and temporal quadrant was 0.408 µm. While the mean trabecular iris angle (TIA) was 26.9° in nasal and 26.01° in temporal quadrant. Conclusion: The study proved that the proposed method of measuring AOD, TISA, TIA is the effective method as the Topcon-2000 OCT does not have any inbuilt software like that of other ASOCT machines.   Keywords: Angle measurement, New technique, Topcon–SD-OCT.

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Abstract

Purpose: To evaluate the angle of anterior chamber with SD-OCT in patients above 40 years of age presenting to tertiary health care center in central India. Materials and Methods: 120 Consecutive patients (240 eyes) above 40 years of age presenting to ophthalmology OPD of tertiary health care center were enrolled in a cross-sectional study. All patients underwent comprehensive ocular examination with included best corrected visual acuity, slit lamp, fundus, gonioscopy, intraocular pressure (IOP), evaluation of angle (i.e. AOD, TISA, TIA) of anterior chamber with SD-OCT. The duration of study was one year six months. Result: The mean age was 53.94 years. There were 61 males & 59 females. It was noted that mean nasal & temporal AOD was less in females (0.4175 µm, 0.4142 µm) as compared to males (0.4583 µm, 0.4613 µm). We found that older people have a narrower anterior chamber angle i.e. from 40-60 years of age mean TIA nasal & temporal was 29.13, 27.53 degree & above 60 years of age mean TIA nasal & temporal was-24.13, 22.63 degrees. Conclusion: We found that AOD is less in female as compared to male. It was also noted that older people have a narrower anterior chamber angle as compared to younger people. The gonioscopy has been considered as the gold standard for characterizing the ACA, but it is contact procedure, subjective and requires the expertise while the OCT is rapid, quantitative, reproducibility, non-contact procedure with less interobserver variability will help us to accurately assess anterior chamber angle. Keywords: Anterior chamber angle measurement, Gonioscopy, Narrow angle, SD-OCT, Normal population.

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