hypermetropia

It is important to notice that Donders' theory makes convergent squint appear as almost a necessary consequence of hypermetropia.

Donders declares no other conclusion to be possible, than this, that the hypermetropia is the cause of the squint.

Asthenopia, which occurs in children in connection with hypermetropia, is nearly always accompanied by defective vision.

In full acuity of vision even high degrees of hypermetropia are no trouble to children.

According to this the percentage of the hypermetropia (including doubtful cases) amounts to 66 per cent.