WEAR (Wearability and Evaluation of Adjustable Refraction) III

WEAR (Wearability and Evaluation of Adjustable Refraction) III: A Randomized Non-inferiority Trial of Children's Wear of Adjustable Glasses

Two-month randomized trial comparing three groups.

Two-month randomized non-inferiority trial (the margin of non-inferiority is 20%) comparing three groups: self-refraction with adjustable glasses, receiving adjustable glasses; subjective refraction by an expert refractionist after computer optometry and receiving custom standard glasses; subjective refraction by an expert refractionist after computer optometry and receiving ready-made glasses. The main outcome of this study is the rate of glasses wear on twice-weekly covert evaluation by head teachers. And the continuous teacher assessment of wearing study glasses will be calculated as the number of times wearing glasses/ Total number of separate observations.

Inclusion Criteria:

• 11-16 years old middle school students from two locations in Guangdong Province.
• With ≤ -1.00 Diopter of myopic refractive error in each eye.
• With uncorrected vision ≤ 6/12 in both eyes thought to be due to refractive error (that is, correctable to at least 6/7.5 with subjective refraction by an optometrist).
• With informed consents(There are two types of informed consents. One of them is whether the parents of the students agree their kids to participate in the project. The other informed consent is whether the parents agree their kids to have the cycloplegic refraction. If the students were admitted to participate in project but without being agreed to have cycloplegic refraction by their parents , they would have non cycloplegic retinoscopy.).

Exclusion Criteria:

• Those corrected VA can not up to 6/7.5 with subjective refraction by an optometrist.
• Those with significant strabismus or vision abnormality (keratopathy, cataract, vitreous macular diseases ), or with vision deficiency ( amblyopia ) children are to be excluded.
• Children developing acquired vision problems other than myopia.