A worldwide survey of retinopathy of prematurity screening.

Background: To ascertain which countries in the world have retinopathy of prematurity (ROP) screening programmes and guidelines and how these were developed.

Methods: An email database was created and requests were sent to ophthalmologists in 141 nations to complete an online survey on ROP screening in their country.

Results: Representatives from 92/141 (65%) countries responded.

The other side of amblyopia.

Amblyopia is defined as a loss of letter recognition visual acuity in the affected eye; however, studies in both nonhuman primates and man have shown that other important aspects of vision, including color, motion, and contour perception, are also abnormal. The anatomical changes that occur in the lateral geniculate nucleus and visual cortex following monocular visual deprivation affect both eyes and follow very different patterns with deprivation that begins at different ages and differ markedly in the magnocellular and parvocellular pathways. The interactions between the eyes and the requirements for recovery are very different following onset at different ages and differ for magnocellular and parvocellular pathways.