- Also c/d long-sightedness.
- It is the refractive state of the eye wherein parallel rays of light coming from infinity are focused behind the retina with accommodation at rest.
- Thus, the posterior focal point is behind the retina.
- Patient can see distant objects more clearly but are unable to see objects properly that near him.
- This is because hypermetropic eyes have problem in focusing the light on the retina from an object that is near & light is focused behind the retina-> Near objects are not clearly seen.
- If the object is placed at a distance away from the eye, the point at which the light focuses properly will shift forward onto the retina-> An object which is positioned at a greater distance becomes distinct & the eye is said to be ‘long-sighted’.
- Near point becomes distant.
- Children with hypermetropia exclusively use accommodation which may cause accommodative convergent squint.
On examination findings are:
- Small eyeball & cornea
- Shallow anterior chamber
- Fundus shows pseudopapillitis & shot silk appearance.
- Degenerative retinoschisis
- Basic principle of treatment is to prescribe convex (plus) lens.
- May be spectacles or contact lenses.
- Corrective surgery may be required.
- Causes of hypermetropia are short axial length of the eyeball, flat cornea & increased refractive index of the cortex of lens.
- Shortening of 2 mm of axial length of eye ball causes 6D hypermetropia.
- Angle closure glaucoma may be associated with Hypermetropia.
- Over correction is preferable in Hypermetropia.
- Refractive condition of the eye at birth is Hypermetropia of 2 D.
Don’t Forget to Solve all the previous Year Question asked on HYPERMETROPIA (HYPEROPIA)