Question

Any two differences between hypermetropia and presbyopia

Answer 1

hypermetropia -

1) this is due to increasing focal length of lens

presbyopia

1) this is due to stiffening of eyeball

hypermetropia

2)to correct this defect convex lens is used

presbyopia

2) to correct this defect bifocal lens is used

Answer 2

Hypermetropia is also called. far sightedness. , that means a person is able to see distant objects clearly but not nearer objects clearly ,, while in

Presbyopia. a person is neither able to see far nor near objects clearly..

Causes of hypermetropia -

1) focal length of the lens increases

2) eye ball becomes too short

Causes of prebyopia -

1) weakening of ciliary muscles.