Abstract
Purpose :
Since spectacles, contact lenses, and surgery can be used to treat anisometropia, in this study, we tested the effects of the Optometric Extension Program (OEP) method (correction with spectacles) and the Mess-und Korrektionsmethodik nach H.-J. Haase (MKH) method on anisometropia by prescription analysis.
Methods :
This study adhered to the Declaration of Helsinki and was approved by the Institutional Review Board of the National Tsing Hua University (11204039). MKH and OEP were performed on 35 patients with anisometropia ≥3.00 D with similar equipment and conditions. Inquiry, objective and subjective refraction, and binocular balance to stereo tests were performed. Different associated heterophoria measurements were taken. For OEP, vergence was obtained with the von Graefe method, while Sheard’s criteria or the 1:1 rule were used to calculate the prism. Examination of both eyes was based on the intuitive application of MKH to cross, pointer, double pointer, rectangle, stereo triangle, and stereo-balance tests. SPSS was used for statistical tests on spherical and astigmatism power, astigmatism and horizontal axis, vertical prism diopter, vergence, stereo vision, and visual acuity. Data are presented as mean±standard error.
Results :
The mean age of the patients was 47.26±2.26 years. The mean spherical, cylinder, spherical equivalent, and visual acuity measurements were -4.39±0.91, -0.90±0.11, -4.83±0.92 D, and 0.02±0.01 LogMAR, respectively, in the right eye and -2.45±0.73, -1.19±0.16, -3.39±0.70 D, and 0.12±0.05 LogMAR, respectively, in the left eye. The mean anisometropia and heterophoria measurements were 5.61±0.45 and 2.28±0.32 D (Δ), respectively. The mean MKH and OEP oculus uterque visual acuity measurements were -0.02±0.009 and 0.04±0.009 LogMAR (p=2×10-6), respectively. The horizontal prisms for MKH and OEP were 0.80±0.12 and 0.02±0.02 (Δ) (p=7×10-9), respectively, in the right eye and 0.81±0.12 and 0.04±0.02 Δ (p=3×10-8), respectively, in the left eye. The mean horizontal prism prescription for MKH and OEP differed by 1.61±0.20 (Δ). The mean MKH and OEP stereo vision measurements were 95.91±8.49 and 168.06±18.71 arc sec (p=1×10-7), respectively. No other significant differences were found.
Conclusions :
MKH results were superior in stereo vision and binocular visual acuity compared to OEP, with a large difference in their horizontal prism.
This abstract was presented at the 2024 ARVO Annual Meeting, held in Seattle, WA, May 5-9, 2024.