Why have them?
Eye diseases are important. They can be obvious to owners, or they can result in blindness which can be distressing, or they can result in pain. Unfortunately some eye diseases are common in certain breeds. Checking dogs for eye disease is commonly practice all round the world.
1. Focal light This gives a bright, concentrated light source. It is used to check the pupil response, the cornea and the iris.
2. Slit Lamp This provides magnification, with a variable slit beam of light. It is extremely useful to examine the eyelids, cornea, aqueous (fluid of the eye), iris, lens, and the anterior portion of the vitreous ( jelly of the eye). Using this machine may enable the detection of early cataracts or small lesions.
3. Voroscope This is ideal for checking the eyelids and the openings of the tear ducts. It enables a magnified view with both hands free to move the eyelids.
4. Indirect Ophthalmoscope A light source and a hand lens allows examination of the fundus (retina and optic nerve). A large area is seen at any one time.
5. Direct Ophthalmoscope This hand held item is used for a magnified look at the fundus. It can also be used to fully examine the edges of the retina. Using the two types of ophthalmoscope maximises the view I get of the retina and optic nerve. Some diseases are more obvious when viewed with one type versus the other type.