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Colours and Shapes - Where to Start with Making a Diagnosis
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The examination of an eye in the horse is often faced with considerable trepidation. Not only are there serious concerns about rider safety but there is the added complication of the physical difficulty of actually getting a meaningful look at the eye. It has been said that there is more power in the eyelid of the horse with a painful eye than the biceps of the strongest human. This is surely true and is a major obstacle to the clinical examination of diseased eyes. However, modern practice has to some extent overcome the major difficulties with sedative and local motor and sensory nerve blocks. This means that there is in fact almost no excuse for not examining an eye thoroughly. However, it is invariably the case that the horse will resent handling and this will limit the ‘clinical return’ of an examination. There are some simple and helpful basic pointers that can be used to help in the diagnosis. These can to some extent be classified as variations in colour and shape.
Colour matters in equine ophthalmology! Obvious variations in colour, for example of the cornea, can be very helpful in establishing things that are wrong and to a large extent give an indication at least of the type of pathology involved. The clinician needs to have experience of the normal colours (or in the case of the ocular media - the complete absence of any colour). [...]
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