Ectopia lentis

Labelled Diagram of the Eye

Labelled diagram of the structure of the retina

Ectopia lentis is the displacement of the lens (of the eye).

Ectopia lentis may be either a complete displacement or a partial displacement.

  • Complete displacement (of the lens) is called lens luxation or luxated lens.
    It can be described in more detail according to the way in which the lens is displaced, such as anterior lens luxation (in which the the lens pushes into the iris or the anterior chamber of the eye) and posterior lens luxation (in which the lens falls back into the vitreous humour).
  • Partial displacement (of the lens) is called subluxation, lens subluxation or subluxated lens.

Causes of ectopia lentis may include:

  • Trauma - such as injury due to accident.
  • Genetic pre-disposition.
  • Association with other disorders such as aniridia or buphthalmos.


Species affected:

Ectopia lentis affects dogs and cats as well as humans. It affects certain breeds of dogs more than others, hence genetic predisposition is suspected in the cases of some dog breeds.

More about Ophthalmology:

This section includes short definitions of many diseases, disorders, and conditions of the eyes and visual system.
For definitions of other terms in this category, choose from the list to the left (but note that this is not a complete/exhaustive list).

Other related pages include

For further information see also our pages of books about ophthalmology.

The following books may also be of interest:

The Aging Eye (Harvard Medical School)
MCQ Companion to the Eye (Textbook)
The Secret of Perfect Vision: How You Can Prevent and Reverse Nearsightedness
What Your Doctor May Not Tell You About(TM) Glaucoma: The Essential Treatments and Advances That Could Save Your Sight

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