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Automatic perimetry in detecting early glaucomatous visual field defects. A follow-up study
1Department of Ophthalmology, Second Affiliated Hospital, Hunan Medical University, Changsha.
Chinese Medical Journal
|April 1, 1992
Summary
Early glaucoma detection is possible by monitoring retinal sensitivity. Subtle declines in light sensitivity in the Bjerrum area often precede typical visual field defects in glaucoma patients.
Area of Science:
- Ophthalmology
- Visual Neuroscience
Background:
- Glaucoma diagnosis relies on detecting visual field defects (VFD).
- Early detection of glaucoma is crucial for timely intervention and vision preservation.
Purpose of the Study:
- To evaluate the predictive value of differential light threshold (DLT) changes for VFD in early glaucoma.
- To identify subtle retinal sensitivity declines preceding established glaucoma VFD.
Main Methods:
- Prospective study involving 50 eyes each of early glaucoma patients and age-matched normal controls.
- Humphrey Field Analyzer used to measure DLT at 42 points in the Bjerrum area.
- Initial Goldmann perimetry was normal for all participants.
Main Results:
- Glaucomatous eyes showed significant generalized and localized retinal sensitivity decline.
- 24 glaucoma eyes developed reproducible VFD after 2.5 years of follow-up.
- VFDs occurred at locations with previously identified reduced light sensitivity.
Conclusions:
- Reduced light sensitivity in the Bjerrum area precedes the development of typical glaucoma VFD.
- DLT measurement is a valuable tool for early glaucoma detection and monitoring.