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Impact of Myopia Control Spectacles on Retinal Image Contrast.

Zhenghua Lin1,2, Dimitrios Christaras3, Harilaos Ginis3

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Summary
This summary is machine-generated.

Myopia control spectacles reduce retinal image contrast. Stellest lenses caused the most significant contrast reduction, while MyoCare and DIMS lenses had similar effects, impacting peripheral vision contrast.

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Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Background:

  • Myopia control strategies like peripheral defocus and contrast modulation inherently reduce retinal image contrast.
  • Direct in vivo comparisons of contrast reduction by different myopia control spectacle designs are lacking.

Purpose of the Study:

  • To evaluate and compare the contrast reduction profiles of various myopia control spectacle designs.
  • To understand the mechanisms underlying contrast modulation in myopia control eyewear.

Main Methods:

  • Retinal image contrast (RIC) was measured using through-focus images (TFIs) from a double-pass instrument in a model eye and 13 human participants.
  • Four spectacle designs (DIMS, Stellest, DOT, MyoCare) and the naked eye (reference) were tested centrally and at eccentricities (10°, 20°).
  • RIC was calculated as the coefficient of variation of pixel intensity in TFIs, with lens decentration assessed for off-axis effects.

Main Results:

  • In a model eye, RIC decreased in the order: naked eye, DIMS, DOT, MyoCare, Stellest.
  • In vivo, Stellest significantly reduced RIC the most, while MyoCare and DIMS showed comparable, moderate reductions.
  • Contrast reduction was primarily influenced by lens optics in the near periphery and ocular optics at larger eccentricities.

Conclusions:

  • All tested myopia control spectacle lenses reduce retinal image contrast.
  • Stellest lenses demonstrated the most significant contrast reduction, followed by MyoCare and DIMS with similar effects.
  • The study highlights differences in contrast modulation among myopia control technologies and their impact on visual perception.