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Abstract #6740 Published in IGR 4-1
Short-wavelength perimetry in diagnosis of early glaucoma: comparison with standard automated perimetry
Qi S; Jiang YChinese Journal of Ophthalmology 2002; 38: 31
OBJECTIVE: To assess the value of short-wavelength automated perimetry in the diagnosis of early glaucoma. METHODS: Forty-six eyes of 36 patients with early open-angle glaucoma and a group of 38 normal persons (46 eyes) were examined by both standard automated (white-on-white, W/W) perimetry and short wavelength (blue-on-yellow, B/Y) perimetry. The age and sex of the two groups were matched. Program 24-2 was performed on both B/Y and W/W fields in the two groups. The mean light sensitivity (MS) of the central 25° and in each quadrant from both perimetries was calculated and analyzed statistically by Student's t test and ASNOV. RESULTS: The difference of MS in the central 25° between the two perimetries in the normal group was 1.63 dB, which was a significant statistical difference (t = 3.57, p < 0.001). MS was significantly higher in W/W than in B/Y both in the central 25° and in each corresponding quadrant (t = 3.45, p < 0.001). The MS difference between them was more than 2.87 dB and the MS average difference of the corresponding quadrant was more than 2.5 dB (t = 4.57, 3.42, p < 0.001). MSs from the four quadrants were different from each other. The lowest MS was in the superior temporal, the highest in the inferior nasal quadrant; the superior and inferior temporal quadrants were between these. The defects on B/Y perimetry were larger and deeper than on W/W perimetry. The result of corrected deviations points (u = 3.22, p < 0.05) was used to account for the defect testing points, which showed that there were significantly more of these points in B/Y perimetry than in W/W perimetry (Χ2 = 226.72, p < 0.001). The data revealed that the defect testing points in B/Y perimetry were 2.6 times those in W/W perimetry. In the early glaucoma group, the positive rate in the abnormal visual field on B/Y perimetry was 87% (40/46), and on W/W perimetry 67% (31/46). CONCLUSIONS: B/Y and W/W perimetry coincide well in both the normal and early open-angle glaucoma groups. B/Y perimetry was more sensitive than W/W in detecting early glaucomatous visual field defects. The positive rate was higher and the defects larger and deeper with B/Y perimetry. Therefore, B/Y perimetry can defect glaucoma defects earlier. It is suggested that B/Y perimetry be applied in diagnosing early glaucoma.LA: Chinese
Dr. S. Qi, Department of Ophthalmology, The Seconde Xiang Ya Hospital of Central South University, Changsha 410011, China. xuhuiye@cs.hn.cn
Classification:
6.6.3 Special methods (e.g. color, contrast, SWAP etc.) (Part of: 6 Clinical examination methods > 6.6 Visual field examination and other visual function tests)