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Abstract #3503 Published in IGR 4-2
Use of high spatial resolution perimetry to identify scotomata not apparent with conventional perimetry in the nasal field of glaucomatous subjects
Westcott MC; Garway-Heath DF; Fitzke FW; Kamal D; Hitchings RABritish Journal of Ophthalmology 2002; 86: 761-766
AIM: To examine whether high spatial resolution perimetry (HSRP) could identify fine scale scotomata which may not be apparent with conventional perimetry. The HSRP was performed in the nasal field, as this location is a recognized site for the early occurrence of glaucomatous defects. METHODS: Sixteen early glaucoma eyes, 17 glaucoma suspect eyes, and 20 age-matched healthy control eyes underwent conventional automated perimetry using the 24-2 program of the Humphrey field analyzer (HFA) and HSRP. The HSRP was performed in the nasal field by testing 9 x 9° of 100 tested points separated by 1°, and the results were compared with the HFA 24-2 program. RESULTS: Mean HSRP thresholds were significantly abnormal in the suspect and glaucoma eyes, with elevated levels of asymmetry between the superior and inferior nasal field. Overall, 7/17 (41%) suspect eyes (95% confidence interval 5/17 (29%) to 7/17 (41%)) had nasal scotomata on HSRP, although their HFA 24-2 fields failed to identify any defects. In glaucomatous eyes, 15/16 (94%) eyes had HSRP scotomata (95% CI 14/16 (88%) to 15/16 (94%)). In 12 these coexisted with HFA 24-2 defects at the same location, while in three eyes only HSRP identified scotomata in the nasal field. CONCLUSION: HSRP can identify scotoma in glaucomatous eyes in the nasal field which may be missed with the lower spatial resolution of conventional perimetry.
Dr. F.W. Fitzke, Department of Visual Science, Institute of Ophthalmology, 11B 43 Bath Street, London EC1V 9 EL, UK.smgx510@ucl.ac.uk
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)
