Development of a frame adaptation for myopia control spectacles
DOI:
https://doi.org/10.70313/2718.7446.v18.n2.423Keywords:
optical frame adaptation, spectacles centering, myopia control spectacles, myopiaAbstract
Purpose: To develop a specific frame adaptation device for myopia control spectacles and conduct its first experimental test.
Methods: Two plastic devices were created, each with a central opening to align with the eye. These are used in front of spectacle frames to verify that the optical treatment zone is correctly positioned. One device adheres directly to the frame and can be easily removed; the other one is handheld and used to test the centering of the 33 mm annular treatment zone. Both devices were tested on a voluntary myopic female subject to evaluate alignment and positioning of optical treatment areas using MyofixTM peripheral plus defocus lenses (developed by Novar, Argentina), which feature a 9 mm central distance vision zone and a peripheral full-diameter treatment zone.
Results: Five different frames were evaluated. The pupil’s position was determined for each frame. With the devices centered on the pupil, the four frame edges (nasal, superior, temporal, and inferior) were assessed for inclusion of the treatment area. Proper centering ensured accurate evaluation of lens alignment. Only two of the five frames allowed full inclusion of the treatment zone within the frame boundaries. For optimal calibration during lens blocking, the devices must be centered as precisely as possible.
Conclusion: Two simple and practical devices were developed to aid in the centering of defocus myopia control spectacles. These tools may be easily implemented in clinical practice in the future.
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