Myopia dominance in preterm infants without and with retinopathy of prematurity: Indian Twin Cities ROP study (ITCROPS) report number 15.

Purpose: To investigate the refractive error profile and progression in infants with different stages of ROP, without ROP, and those who received laser treatment for ROP.

Methods: This retrospective study included the data from 838 infants (baseline mean age 3.7 ± 5.

Ambient light level varies with different locations and environmental conditions: Potential to impact myopia.

Purpose: Considering that time spent outdoors is protective for myopia, we investigated how ambient light levels reaching the eye varies across 9 outdoor and 4 indoor locations in 5 different environmental conditions.

Methods: Illuminance (lux) was recorded using a lux meter under conditions of weather (sunny/cloudy), time of a day (7:00,10:00,13:00, and 16:00 hours), seasons (summer/winter), and sun protection (hat and cap) in outdoor and indoor locations. Nine outdoor locations were "open playground", "under a translucent artificial-shade", "under a porch facing east", "under a porch facing south", "under a big tree", "between three buildings", "within 4 buildings", and "canopy".