Ophthalmology / Treatment Outcome / Visual acuity / Contact Lenses / Humans / Child / Cataract / Clinical Sciences / Optometry and Ophthalmology / Public health systems and services research / Postoperative Complications / Child preschool / Child / Cataract / Clinical Sciences / Optometry and Ophthalmology / Public health systems and services research / Postoperative Complications / Child preschool