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| − | ==Introduction==
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| − | [[Image:Cataract donkey.jpg|right|thumb|250px|<small><center>Complete visual impairment from advanced cataract
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| − | with continual mydriasis. (Image courtesy of [http://drupal.thedonkeysanctuary.org.uk The Donkey Sanctuary])</center></small>]]
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| − | A high proportion of [http://drupal.thedonkeysanctuary.org.uk The Donkey Sanctuary’s] herd is elderly and so acquired, diffuse cataracts are very common. These are easily diagnosed.
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| − | ==Clinical Signs==
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| − | * The '''lens is obviously opaque''' and the '''pupil fully dilated in severe cases'''
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| − | * There is '''reduced vision''', especially in dim light
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| − | * '''Lack of a pupillary light response''' (PLR) indicates an advanced condition
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| − | * They can be unilateral or bilateral
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| − | ==Diagnosis==
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| − | '''Pupillary dilation''' should be achieved prior to ophthalmoscopy to check the extent of the cataract, to rule out [[Lens Luxation - Donkey|lens luxation]] and to check the fundus for [[Uveitis - Donkey|recurrent uveitis]], which will eventually cause cataracts. As most cases are secondary to [[Uveitis - Donkey|recurrent uveitis]], '''posterior synechiae''' develop due to the inflammatory response.
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| − |
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| − | <u>'''Nuclear sclerosis'''</u> can be mistaken for cataracts. This is a normal ageing response as the lens hardens and takes on a
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| − | ‘pearl-like’ appearance. However, the fundus is still visible through this.
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| − | ==Treatment==
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| − | '''Surgery''' to remove the lens is useful in cases of''' congenital cataracts'''. The optimal age for surgery is during the first few months. If [[Uveitis - Donkey|recurrent uveitis]] has occurred then the success rates are lower.
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| − | ==Literature Search==
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| − | [[File:CABI logo.jpg|left|90px]]
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| − | Use these links to find recent scientific publications via CAB Abstracts (log in required unless accessing from a subscribing organisation).
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| − | <br><br><br>
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| − | [http://www.cabdirect.org/search.html?q=title%3A%28cataract%29+AND+od%3A%28donkeys%29+ Cataracts in donkeys publications]
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| − |
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| − | [http://www.cabdirect.org/search.html?q=title%3A%28cataract%29+AND+od%3A%28horses%29+ Cataracts in horses publications]
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| − | ==References==
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| − | * Grove, V. (2008) Conditions of the eye In Svendsen, E.D., Duncan, J. and Hadrill, D. (2008) ''The Professional Handbook of the Donkey'', 4th edition, Whittet Books, Chapter 11
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| | {{toplink | | {{toplink |
| | |backcolour = D1EEEE | | |backcolour = D1EEEE |
| | |linkpage =Lens Diseases - Donkey | | |linkpage =Lens Diseases - Donkey |
| | |linktext =Lens Diseases - Donkey | | |linktext =Lens Diseases - Donkey |
| | + | |rspace={{Donkey}} |
| | |pagetype=Donkey | | |pagetype=Donkey |
| | }} | | }} |
| − | {{infotable
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| − | |Maintitle = [[Sponsors#The Donkey Sanctuary|This section was sponsored and content provided by '''THE DONKEY SANCTUARY''']]
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| − | |Maintitlebackcolour = B4CDCD
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| − | }}
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| − | [[Category:Donkey]]
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| − | [[Category:Lens Diseases - Donkey ]]
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