Long-sight, or hypermetropia, signifies that the eyeball is too short or the lens too flat.
Limits of error in the subjective and objective determination of hypermetropia.
Ophthalmoscopically with atropine the same degree of hypermetropia.
Hypermetropia was found then in 47 per cent of all the cases.
Donders declares no other conclusion to be possible, than this, that the hypermetropia is the cause of the squint.
It is important to notice that Donders' theory makes convergent squint appear as almost a necessary consequence of hypermetropia.
According to this the percentage of the hypermetropia (including doubtful cases) amounts to 66 per cent.
In full acuity of vision even high degrees of hypermetropia are no trouble to children.
Asthenopia, which occurs in children in connection with hypermetropia, is nearly always accompanied by defective vision.
As a rule preponderance of the interni in hypermetropia leads eventually to convergent squint even in childhood.