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[Aniseikonia of central serous chorioretinopathy]
Abstract:
Central serous chorioretinopathy (CRS) is one of the typical diseases that accompany micropsia. However very little is known about micropsia of CRS, because of the difficulty to measure "aniseikonia" in terms of micropsia. Aniseikonia in 65 cases of CRS was measured quantitatively by Awaya's New Aniseikonia Tests (NAT). The tests were performed at two different distances of 40 cm (visual angle: 6 degrees) and 20 cm (12 degrees) and under 4 meridians of the halfmoon on NAT, horizontal, 45 degrees, vertical and 135 degrees, respectively. The mean value of aniseikonia under each testing condition was as follows: 6 degrees horizontal -3.13%, 45 degrees -2.56%, vertical -2.13%, 135 degrees -2.57%, 12 degrees; horizontal -1.38%, 45 degrees -1.69%, vertical -1.84%, 135 degrees -1.50%. At 6 degrees aniseikonia is larger in the horizontal meridian than in the vertical with statistical significance (t-test, p less than 0.05), while at 12 degrees aniseikonia is smaller than at 6 degrees and shows no particular tendency in terms of meridian. The phenomenon observed at 6 degrees may be what is called "oriented metamorphopsia".
Insights
Central serous chorioretinopathy (CRS) causes micropsia, a visual distortion. Quantitative aniseikonia measurements revealed significant horizontal aniseikonia at a 6-degree visual angle, suggesting oriented metamorphopsia in CRS patients.
Area of Science:
- Ophthalmology
- Visual Science
- Retinal Diseases
Background:
- Central serous chorioretinopathy (CRS) is frequently associated with micropsia.
- Understanding and quantifying micropsia in CRS is challenging due to measurement difficulties.
- Aniseikonia, a form of micropsia, is poorly understood in the context of CRS.
Purpose of the Study:
- To quantitatively measure aniseikonia in patients with CRS.
- To investigate the relationship between aniseikonia and visual angle/meridian in CRS.
- To explore the potential link between observed aniseikonia patterns and "oriented metamorphopsia".
Main Methods:
- Sixty-five cases of CRS were evaluated using Awaya's New Aniseikonia Tests (NAT).
- Aniseikonia was measured at two visual angles: 6 degrees (40 cm) and 12 degrees (20 cm).
- Measurements were taken across four meridians: horizontal, 45 degrees, vertical, and 135 degrees.
Main Results:
- At a 6-degree visual angle, aniseikonia was significantly larger in the horizontal meridian compared to the vertical (p < 0.05).
- Mean aniseikonia values at 6 degrees were: horizontal -3.13%, 45 degrees -2.56%, vertical -2.13%, 135 degrees -2.57%.
- At a 12-degree visual angle, aniseikonia was generally smaller than at 6 degrees and showed no specific meridianal tendency. Mean values: horizontal -1.38%, 45 degrees -1.69%, vertical -1.84%, 135 degrees -1.50%.
Conclusions:
- Significant horizontal aniseikonia at a 6-degree visual angle in CRS patients may represent "oriented metamorphopsia".
- Aniseikonia magnitude decreases with increasing visual angle in CRS.
- Further research is needed to fully elucidate the mechanisms of micropsia in CRS.