Retinal nerve fiber layer defect patterns in primary angle-closure and open-angle glaucoma: a comparison using optical coherence tomography.

PURPOSE: To compare the patterns of retinal nerve fiber layer (RNFL) thickness loss in primary angle-closure glaucoma (PACG) and primary open-angle glaucoma (POAG) using optical coherence tomography (OCT). METHODS: Forty-three participants with PACG and 60 with POAG underwent fast RNFL thickness measurement by OCT. Eyes were classified according to the visual field mean deviation (VF-MD) into mild (>-8 dB), moderate (-8 dB to >-16 dB), and advanced (≤ -16 dB) glaucoma subgroups. The raw RNFL thickness data were compared with data from the Thai normative database. RESULTS: Mean (SD) age was 67.0 (9.6) and 64.1 (11.6) years in the PACG and POAG groups, respectively (P = 0.19). In the mild subgroups, a focal RNFL thickness loss was found in the inferior area in the POAG group, but not in the PACG group. The RNFL defect involved sectors 1, 6, and 7 in the moderately advanced disease subgroups of both PACG and POAG and extended through almost all sectors in the advanced disease subgroups. The deepest RNFL defect, -17.25 µm, was found in sector 6 of the mild POAG subgroup, compared with -8.78 µm in the PACG group (P = 0.04). The number of affected points in each sector in the mild subgroups was greater in the POAG group than in the PACG group. CONCLUSION: Participants with mild POAG had deeper and more localized RNFL defects than did participants with PACG. The pattern was similar in participants with moderate or advanced disease.

Normative database of retinal nerve fiber layer and macular retinal thickness in a Thai population.

PURPOSE: To investigate the distribution of retinal nerve fiber layer (RNFL) and macular retinal thickness measured by optical coherence tomography (OCT) in a Thai population. METHODS: We studied one eye each of 250 healthy subjects [age > or = 18 years; spherical refractive error within +/-6 diopters (D); astigmatism < or =3 D; no ocular pathology]. A complete eye examination, standard automated perimetry, and fast RNFL and macular thickness measurement by OCT were performed, and a disc photograph was taken. The distributions of both thicknesses, including their relationship with demographic data, were analyzed. RESULTS: The mean +/- SD age of the study population was 44.7 +/- 12.2 years. The mean +/- SD RNFL thickness was 109.3 +/- 10.5 m, which was 10% thicker than that in the OCT normative database. RNFL decreased 2.3 m per decade (P < 0.001). Sex and spherical equivalent were not associated with RNFL thinning. The mean +/- SD central foveal thickness was 183.2 +/- 1.3 m. The macular thickness in the outer area was significantly thinner than that in the inner area (P < 0.001). The temporal regions were the thinnest among the four quadrants (P < 0.001). Thinning of all macular areas, except the center, was found to be associated with advancing age (P < 0.05). CONCLUSIONS: RNFL thickness in the measured Thai population was about 10% thicker than that in the original normative database. Macular thickness and RNFL thickness in the superior and inferior quadrants decreased with advancing age.

Ocular diseases in patients with rheumatic diseases.

To study the distribution of ocular involvement among persons with rheumatic disease, a cross-sectional survey was performed in 224 patients attending the Division of Rheumatology, Department of Medicine, Maharaj Nakorn Chiang Mai Hospital. Of these patients, 102 presented with rheumatoid arthritis, 74 systemic lupus erythematosus, 39 systemic sclerosis, 6 mixed connective tissue disease, 2 polymyositis and 1 juvenile rheumatoid arthritis. It was found that the ocular involvement probably related to diseases including dry eye (19.9%) and uveitis (0.4%). The ocular involvement was presumably related to treatment including retinopathy (7.6%), cataract (6.3%), and glaucoma (0.9%). Rapid recognition of these complications would lead to early and appropriate management, which would prevent their sequelae.