Choroidal Response to the Modified Defocus Incorporated Multiple Segments Spectacle Lenses

Inclusion Criteria

• •Hong Kong Chinese
• •Age at enrolment: 6 - 13 years
• •Myopia in spherical power: -1.00D to -5.00D in both eyes
• •Astigmatism: equal or less than 2.00D
• •The sum of spherical power and astigmatism: equal or less than -7.00D
• •Anisometropia (spherical equivalent refraction (SER)): equal or less than 1.50D
• •Previous myopia progression (valid documentation dated within 2 years before screening):
• •* -0.50D (SER) per year or more in both eyes OR Axial length elongation: 0.27mm/year in both eyes
• •* If myopia is initially detected during screening, eligibility requires myopia (in SER) below the 3rd percentile curve of refraction in both eyes.12
• •Best corrected visual acuity: LogMAR 0.04 or better in both eyes
• •Ocular health: no abnormalities in both internal and external ocular health
• •Binocular vision: no strabismus and other binocular abnormalities
• •Normal colour vision
• •Willing to wear the study spectacles all the time (10 hours per day, for 7 days per week)