- The average spherical equivalent was - 2.81± 4.16 (range: from - 16.5D to + 5D) - The prevalence of myopia, high myopia and degree of myopia were concluded to besignificantly associated with 4 factors: 1) birth weight, 2) gestation age, 3) ROP either treated or regressed without treatment, 4) status of regressed ROP.