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[In kinetic perimetry high refractive errors also influence the isopter position outside the central 30 degrees].
Susanne Niederhauser1, Daniel Stéphane Mojon
1Abteilung für Strabologie und Neuroophthalmologie, Kantonsspital, St. Gallen, Germany.
Klinische Monatsblatter Fur Augenheilkunde
|May 22, 2002
Summary
Refractive errors significantly impact peripheral visual field testing in kinetic perimetry for high myopia and hyperopia. Correction with contact lenses is recommended for accurate peripheral visual field assessment in these cases.
Area of Science:
- Ophthalmology
- Visual Science
Background:
- Kinetic perimetry typically corrects refractive errors only within the central 30 degrees of the visual field.
- The influence of uncorrected refractive errors on the peripheral visual field remains largely uninvestigated.
Purpose of the Study:
- To investigate the effect of uncorrected refractive errors on peripheral visual field measurements.
- To determine if refractive correction is necessary for accurate peripheral visual field assessment.
Main Methods:
- Experimental clinical study involving 58 myopic and 30 hyperopic eyes with refractive errors ranging from -25 D to +17.25 D.
- Peripheral visual fields were assessed with and without contact lens correction.
- Statistical analysis (95% confidence intervals) was used to identify significant effects of refractive errors on isopter positions.
Main Results:
- Significant inward displacement of the I4e isopter was observed in uncorrected myopia > 11 D and hyperopia > 9 D.
- Significant inward displacement of the I3e isopter occurred in uncorrected myopia > 18 D and hyperopia > 13 D.
- No influence of refractive errors was detected on the V4e isopter.
Conclusions:
- Contact lens correction is recommended for kinetic perimetry of the peripheral visual field in eyes with myopia > 11 D and hyperopia > 9 D.
- Refractive correction is not necessary when only determining the boundaries of the visual field.