Axial length changes with peripheral defocus Fresnel spectacles for myopia control
the Myofix study
DOI:
https://doi.org/10.70313/2718.7446.v18.n4.455Keywords:
Fresnel lens, myopia controlAbstract
Purpose: This study explores choroidal thickness increments while reading with a device based on an adaptation of Myofix peripheral defocus spectacle design for myopia control.
Methods: A series of voluntary myopic young subjects were tested for 20 minutes reading a book on computer display with their usual correction and for another 20 minutes reading with Myofix spectacles constructed with a plus 3.5 diopters add Fresnel lens. The Fresnel lens was carved with a central 9 mm hole for distance vision through the usual correction and was adapted in a plano 37 mm diameter lens probe. Usual correction with the Fresnel lens was fitted in trial frames. The axial length was measured at baseline and after each period of reading.
Results: For this study, 16 subjects of both genders (4 females) were tested with Myofix Fresnel lenses. Their mean age was 22.51+/-5.78 years. Their mean spherical equivalent of the right eye was -2.48+/-0.96 diopters. There was a non-significant increase of +1.55 microns in axial length from baseline when reading with the usual prescription (p=0.561). When subjects read in the same situation with Myofix Fresnel defocus spectacles for other 20 minutes, axial length decreased by -8.22 microns (p=0.002).
Conclusions: The Myofix design applied in a Fresnel lens with the usual correction produces axial length shortening in a similar manner as the polycarbonate carved lens. This short term axial length shortening is in line with an effect in arresting myopia progression as has been demonstrated in the Myofix trial.
Methods: A series of voluntary myopic young subjects were tested for 20 minutes reading a book on computer display with their usual correction and for another 20 minutes reading with Myofix spectacles constructed with a plus 3.5 diopters add Fresnel lens. The Fresnel lens was carved with a central 9mm hole for distance vision through the usual correction and was adapted in a plano 37mm diameter lens probe. Usual correction with the Fresnel lens was fitted in trial frames. The axial length was measured at baseline and after each period of reading.
Results: For this study, 16 subjects of both genders (4 females) were tested with Myofix Fresnel lenses. Their mean age was 22.51+/-5.78 years. Their mean spherical equivalent of the right eye was -2.48+/-0.96 diopters. There was a non-significant increase of +1.55 microns in axial length from baseline when reading with the usual prescription (p=0.561). When subjects read in the same situation with Myofix Fresnel defocus spectacles for other 20 minutes, axial length decreased by -8.22 microns (p=0.002).
Conclusions: The Myofix design applied in a Fresnel lens with the usual correction produces axial length shortening in a similar manner as the polycarbonate carved lens. This short term axial length shortening is in line with an effect in arresting myopia progression as has been demonstrated in the Myofix trial.
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