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Effect of pterygium on contrast sensitivity
Archana Malik1, Sudesh K Arya, Sunandan Sood
1Department of Ophthalmology, Kalpana Chawla Medical College & Hospital, Karnal, India, drarchanag2002@yahoo.com.
International Ophthalmology
|August 17, 2013
Summary
Pterygium growth significantly reduces contrast sensitivity in both bright (photopic) and dim (mesopic) light. Even small pterygium sizes negatively impact vision, highlighting the importance of monitoring this eye condition.
Area of Science:
- Ophthalmology
- Vision Science
Background:
- Pterygium is a common ocular condition affecting the cornea.
- Its impact on visual function, particularly contrast sensitivity, requires further investigation.
Purpose of the Study:
- To evaluate the effect of pterygium on contrast sensitivity under photopic and mesopic conditions.
- To determine the correlation between pterygium size and contrast sensitivity reduction.
Main Methods:
- A case-control study involving 36 eyes with pterygium and 18 control eyes.
- Pterygium size was measured vertically, horizontally, and by area.
- Contrast sensitivity was assessed using CSV-1000E charts at various spatial frequencies.
Main Results:
- Significant reductions in both photopic and mesopic contrast sensitivity were observed in eyes with pterygium.
- Contrast sensitivity decreased significantly with pterygium vertical length >3 mm, horizontal width ≥0.5 mm, and area >7 mm(2).
- A significant negative correlation was found between pterygium size parameters and contrast sensitivity.
Conclusions:
- Pterygium significantly impairs contrast sensitivity across all tested spatial frequencies and lighting conditions.
- Even moderate pterygium growth negatively affects visual function.
- Early detection and management of pterygium are crucial for preserving visual acuity.
