Classification of Hypermetropia by the action of accommodation.

Hypermetropia Classification by the action of accommodation

Total Hypermetropia(Ht)

Total Hypermetropia(Ht): It can be found out by abolishing the tone of ciliary muscle by cycloplegics like atropine. Total hypermetropia is classified into two Latent and manifest

Latent Hypermetropia(Hl)

Latent Hypermetropia(Hl): It is the amount of hypermetropia which is corrected normally by the normal tone of ciliary muscle.

Manifest Hypermetropia(Hm)

Manifest Hypermetropia(Hm): Is made up of two components.
  • (A) Facultative Hypermetropia(Hf): It is that part of hypermetropia which can be corrected by the effort of accommodation.
  • (B) Absolute Hypermetropia(Ha): Which cannot be overcome by the effort of accommodation.


Clinical test to find out different types of manifest hypermetropia:

  1. Manifest Hypermetropia(Hm): The strongest convex lens with which the patient can still maintain full distance vision 6/6 ,indicates manifest hypermetropia.
  2. Absolute Hypermetropia(Ha): If the patient can not see 6/6 without a lens then the weakest convex lens that will allow him to read this line indicates absolute hypermetropia.
  3. Facultative Hypermetropia(Hf): Facultative hypermetropia=Manifest hypermetropia-Absolute hypermetropia.
  4. Total Hypermetropia(Ht): It can be find out by abolishing the tone of ciliary muscle by cycloplegics like atropine.
  • Total hypermetropia= Latent hypermetropia+ Manifest hypermetropia (Facultative+Absolute).

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