Effect of Light-Blocking Lenses on Hyperopic Anisometropic Children

A Prospective Randomized Controlled Trial on the Effect of Light-Blocking Lenses on Emmetropization in Hyperopic Anisometropic Children

To evaluate the effectiveness of light-blocking lenses in promoting emmetropization and reducing anisometropia in children with hyperopic anisometropia, and to assess the impact of light-intercepting lenses on visual function in this population.

Inclusion Criteria:

• Aged 6 years or older and 12 years or younger;
• The more hyperopic eye has a spherical refractive error between +3.0 D and +7.5 D; the less hyperopic eye has a spherical refractive error of at least +2.0 D; cylindrical refractive error between -2.0 D and 0 D; interocular difference in spherical power >=1.5 D and in cylindrical power <=1.0 D;
• Best-corrected visual acuity of 0.0 logMAR or better in both eyes;
• Ocular deviation with spectacles less than 10 prism diopters;
• Has been wearing standard single-vision spectacles regularly for more than six months;
• In good general health, capable of receiving the study intervention, and willing to comply with the study protocol;
• Written informed consent obtained from both the parent/guardian and the child, with agreement to comply with all study procedures and maintain follow-up availability throughout the study period;

Exclusion Criteria:

• History of ocular trauma or eye surgery;
• Presence of pathological abnormalities on anterior or posterior segment examination, or a history of organic ocular diseases such as cataract, glaucoma, corneal disease, or fundus disorders;
• Intraocular pressure greater than 21 mmHg;
• Presence of systemic diseases or other conditions deemed unsuitable for study participation;
• Any other condition deemed inappropriate for participation in the clinical trial by the investigator;