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Other eye defects found were:—Blepharitis, 21 cases ; Corneal ulcer,
2 cases; Corneal nebulae, 16 cases; Ptosis, 4 cases; Congenital cataract, one
case.
Four boys were completely blind in one eye, and two boys had lost
an eye.
Vision.
The numbers of children with good and defective vision are given
below. The vision of each eye is tested separately by means of test types.
On the test cards are a number of types, the smallest of which should be
read by a child with normal eyesight at a distance of 5 metres, or 16½ feet;
the next at a distance of 6 metres, or 19¾ feet; and the largest should be
read at a distance of 60 metres. The child is placed at a distance of
6 metres. If he can read the smallest type his sight is 6/5; if he can
read the next one only, it is 6/6, i.e., normal sight; if he can only read the
largest type, it is 6/60.
The vision of the children was:—