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Contrast sensitivity and glare in cataract using the Pelli-Robson chart
T H Williamson1, N P Strong, J Sparrow
1Tennent Institute of Ophthalmology, Glasgow.
The British Journal of Ophthalmology
|December 1, 1992
Summary
A simple glare test using a pen torch and the Pelli-Robson chart effectively measures glare disability in cataract patients. This rapid clinical test aids in preoperative evaluation, showing significant contrast sensitivity reduction in cataracts.
Area of Science:
- Ophthalmology
- Clinical Optics
Background:
- Cataract surgery requires preoperative assessment of visual function.
- Glare disability significantly impacts vision but lacks convenient clinical tests.
Purpose of the Study:
- To evaluate a convenient clinical test for glare disability in cataract patients.
- To compare contrast sensitivity, near vision, and visual acuity with and without glare.
Main Methods:
- 70 cataract patients, 15 pseudophakic patients, and 19 controls were tested.
- Glare was induced using a disposable pen torch.
- Pelli-Robson letter chart assessed contrast sensitivity; near vision and visual acuity were also measured.
Main Results:
- Contrast sensitivity showed the most significant reduction under glare conditions.
- Cortical and posterior subcapsular cataracts were most affected by glare.
- Glare disability was minimal in pseudophakic patients and absent in healthy controls.
Conclusions:
- Glare testing with a pen torch and Pelli-Robson chart is a rapid and clinically applicable method.
- This test can be easily integrated into the preoperative evaluation of cataract patients.
- It effectively quantifies glare disability, aiding surgical decision-making.