Highly Aspherical Lenslet (HAL) and Binocular Vision (BV) Disorders [HALT X(T) Study]

Inclusion Criteria: Age 5-12 years old Myopia of between -1D and -6D in at least 1 eye Progression of at least 0.5D within the last year Astigmatism less than 2.5D Exotropia Exophoria: horizontal deviation \<40PD Esotropia (good control), Esophoria: horizontal deviation \<40PD Any vertical strabismus: Vertical deviation \<10 PD Intermittent exotropia (good, moderate, poor) Horizontal deviation ≥15 PD, vertical deviation ≤5 PD (?) Exclusion Criteria: VA poorer than logMAR 0.2 (6/9.5) in either eye Any other ocular condition (e.g. lens opacity, glaucoma) other than myopia, strabismus or nystagmus) Any medical/neurological condition which would interfere with subjects ability to co-operate with tests and attend follow-up appointments. Plans of surgery for strabismus or nystagmus in the next year Constant XT). Past use of any other from of myopia control treatment (eg. atropine or myopia control glasses or contact lenses) within the last year.