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Normal values for fundus perimetry with the scanning laser ophthalmoscope
K Rohrschneider1, M Becker, N Schumacher
1Department of Ophthalmology, University of Heidelberg, Germany. Klaus_Rohrschneider@ukl.uni-heidelberg.de
American Journal of Ophthalmology
|July 31, 1998
Summary
Fundus perimetry provides reliable visual field measurements comparable to conventional methods. Light sensitivity decreases with age, and fixation stability declines in older individuals.
Area of Science:
- Ophthalmology
- Visual Science
Background:
- Full-threshold static fundus perimetry requires age-corrected normal values for accurate interpretation.
- Comparison with conventional computerized perimetry necessitates established normative data.
Purpose of the Study:
- To determine normal light sensitivity values using fundus perimetry across different age groups.
- To assess the short-time fluctuation (reliability) of these measurements.
- To establish age-corrected normative data for fundus perimetry.
Main Methods:
- Full-threshold static fundus perimetry was performed on 152 eyes from 99 healthy individuals (ages 16-77).
- Central visual field (33 x 21 degrees) was assessed using a scanning laser ophthalmoscope.
- Fixation stability was monitored, and light sensitivity was analyzed by age and location.
Main Results:
- A significant age-related decline in light sensitivity was observed (0.275 dB/decade, P < .0001).
- Mean sensitivity was 16.6 dB at age 10, decreasing with age.
- Fixation stability decreased with age (2.82 arc minutes/decade, P < .0001).
- Test-retest variability was comparable to short-time fluctuation.
Conclusions:
- Fundus perimetry offers reliable visual field measurements comparable to computerized perimetry.
- Age is significantly correlated with decreased light sensitivity in fundus perimetry.
- Fixation stability diminishes with increasing age, even in healthy subjects.