Phase I: Focus groups on different designs of adjustable glasses and standard glasses (August-September 2012) Phase II: Two-month randomized trial comparing four groups: (September 2012 - August 2013)

Phase I: Focus groups on different designs of adjustable glasses and standard glasses (August-September 2012) Phase II: Two-month randomized trial comparing four groups: self-refraction with adjustable glasses, receiving custom standard glasses; subjective refraction by an expert refractionist after cycloplegic automated refraction and receiving custom standard glasses; subjective refraction by a rural refractionist after cycloplegic automated refraction, receiving custom standard glasses; and subjective refraction by an expert refractionist after cycloplegic automated refraction receiving ready made glasses (September 2012 - August 2013)

Inclusion Criteria:

phase1: - aged 12-17 years

• with <= -1.00D of myopic refractive error in each eye phase2: - 12-15 years old children from two locations in Guangdong Province
• with uncorrected vision \