Effect of vertex distance in the treatment area of myopia control spectacles
DOI:
https://doi.org/10.70313/2718.7446.v17.n04.367Keywords:
myopia control, spectacles, treatment area, visual fieldsAbstract
Purpose: To analyze the size of treatment area produced by possible myopia control spectacles at two different vertex distances.
Methods: An experimental study was designed. Two visual fields were performed in an Octopus 123 automatic perimeter (Interzeag, Germany), with an opaque frame of 37 mm diameter including a central hole of 8 mm wide, fitted in the trial lenses from the perimeter, with two different vertex distances (6 mm and 12 mm) in a 60 years-old subject. The frame around the central hole represents the treatment area of commercially available myopia control spectacles which have a central round zone for clear distance vision.
Results: The visual field with a 12 mm vertex distance showed an expected circular loss of sensitivity at approximately 12°. While the 6mm vertex distance visual field showed an almost normal visual field.
Conclusion: A normal vertex distance produces better area of treatment than a shorter one in myopia control spectacles. The results of the present study suggest that vertex distance should be rigorously monitored in myopia control practice and research.
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