High spatial resolution automated perimetry in glaucoma
Open Access
- 1 June 1997
- journal article
- research article
- Published by BMJ in British Journal of Ophthalmology
- Vol. 81 (6), 452-459
- https://doi.org/10.1136/bjo.81.6.452
Abstract
BACKGROUND Automated perimetry is of fundamental importance in assessing visual function in glaucoma. A technique was evaluated to perform high spatial resolution automated perimetry to allow a more detailed assessment of the luminance sensitivity in selected regions of the visual field than is possible with conventional perimetry. METHOD High spatial resolution perimetry was performed using a Humphrey automated perimeter by measuring luminance sensitivity across a 9 by 9 degree custom grid of 100 test locations with a separation between adjacent locations of 1 degree. Quantitative analysis of the raw and Gaussian filtered thresholds was performed to assess the repeatability of the technique in normals, glaucoma suspects, and glaucoma patients. RESULTS The testing protocol was well tolerated by all subjects. High spatial resolution perimetry in glaucomatous eyes demonstrated fine luminance sensitivity loss not suspected with conventional perimetry. High spatial resolution perimetry also demonstrated reproducible areas of sensitivity loss in some glaucomatous eyes in areas of the visual field which appear normal with conventional programmes. The repeatability of the technique correlated with mean threshold sensitivity and was substantially improved to clinically acceptable levels by Gaussian filtering the thresholds. CONCLUSION This technique of high spatial resolution perimetry allows the practical assessment of selected regions of the visual field at higher resolution than conventional perimetry, and may be clinically useful in glaucoma.Keywords
This publication has 21 references indexed in Scilit:
- VISUAL FIELD AND RETINAL NERVE FIBRE LAYER IN EARLY GLAUCOMA AFTER OPTIC DISC HAEMORRHAGEActa Ophthalmologica, 2009
- Image processing of computerised visual field data.British Journal of Ophthalmology, 1995
- Angioscotomata and morphological features of related vessels in automated perimetry.British Journal of Ophthalmology, 1995
- Long-term Functional Outcome after Early Surgery Compared with Laser and Medicine in Open-angle GlaucomaOphthalmology, 1994
- Perimetric point density and detection of glaucomatous visual field lossActa Ophthalmologica, 1993
- Nerve Fiber Layer Defects with Normal Visual FieldsOphthalmology, 1993
- The visual field in advanced glaucomaInternational Ophthalmology, 1989
- Probing visual function with psychophysics and photochemistryEye, 1989
- What Is the Most Suitable Grid for Computer Perimetry in Glaucoma Patients?Ophthalmologica, 1986
- Variability of Static Visual Threshold Responses in Patients With Elevated IOPsAmerican Journal of Ophthalmology, 1982