He needs to be admonished not to have a mind which is narrow or myopic.
Silicone contact lenses allow a marked increase in oxygen to reach the eye decreasing the probability of myopic increases.
Less than 5 percent of five year olds are myopic, but this percentage increases to 25 percent by late teens and to approximately 35 percent for young adults and to 42 percent of those middle-aged.
Retinal detachments and tears are possible, however, in highly myopic children or adolescents who play contact sports.
The degree to which one is myopic depends on the powers of the cornea and the lens of the eye and the length of the eyeball.
But if a child has become at least 0.25 diopters myopic at this age then there is a 60 percent chance that the child will require spectacle correction for nearsightedness by age 13.
This drops to at most 40 percent when only one parent is nearsighted, and for 15 percent of myopic children, neither parent has myopia.
ROP is seen in 68 percent of infants with low birth weights and over 80 percent of infants born with ROP will be myopic.
A X Jo magnification is, however, by no means guaranteed to a myopic eye of - io D by a lens of i in.
For the observation of small objects, a myopic eye is consequently superior to a normal eye; and the normal eye in its turn is superior to the hypermetropic one.