Effect of Defocus in Soft Contact Lenses on Internal Retinal Vascularization

The purpose of this study is to gain a better understanding of the retinal vascular changes that occur in response to the optical effect of a myopic defocus daily disposable soft contact lens (MDSL) in a group of healthy young myopic adults (18-35 years; myopia -1.00D to -4.00D; all genders). It will also learn about the acceptance of this visual correction modality compared to regular contact lenses.

The main questions to be answered are:

* To evaluate changes in retinal blood flow by visualizing retinal vascular density in the superficial and deep plexus after one week of MDSL wear.
* To evaluate changes in choroidal thickness at the macular level after one week of MDSL wear.
* To evaluate the visual comfort provided by this MDSL design using a questionnaire.

Researchers will compare the MDSL to a daily disposable single vision soft lens (SVSL) used to correct myopia to determine if the addition of a defocus area makes a difference in the retinal response to the visual signal.

Participants will be required to

* Wear both MDSL and SVSL for one week each, in a random order.
* Read letters to measure visual acuity
* Have a deep scan of their retina with an optical coherence tomography (OCT) device
* Rate the comfort and vision provided by both devices using a questionnaire.

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Study Sponsored By

Université de Montréal

Participants Required

More Information

Study ID: NCT06527274