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The darker the eye colour, the more melanin is present in the iris. Some cats have odd coloured eyes such as one blue, one yellow which is known as heterochromia. All kittens are born with blue eyes; they change colour between 4-10 weeks as melanin granules accumulate in the irises. What is the rarest eye colour in cats? Aqua is an unusual eye colour that occurs most commonly in Tonkinese and Snow Bengal cats. It has a blue-green hue. Eye disorders There are many disorders that can affect cats, too many to list here, the most common include: Cataracts (opacity of the lens) Glaucoma (increase in pressure inside the eye) Uveitis (inflammation of the inner structures of the eye) Corneal ulcers Retinal diseases Retinal detachment Tumours Corneal disease Eye infections Foreign body lodged in the eye Conjunctivitis (inflammation of the conjunctiva) Keratoconjunctivitis sicca (KCS/dry eye) Trichiasis (eye irritation from the lashes) Entropion (eyelid rolled inward) Eye worms Brown spots in the eyes (melanoma, melanocytes) The following conditions can cause blindness: High blood pressure Lead poisoning Taurine deficiency Portosystemic shunt Diabetes Roundworms Certain medications Symptoms of eye disorders Symptoms can vary depending on the condition, but be alert for the following: Watery eyes (epiphora) Cloudy eyes Different sized pupils(anisocoria) Lumps and bumps on any part of the eye Pawing at the eye Painful eye Bulging eye (proptosis) Film over the eye Bulging or sunken eye (enophthalmos) Squinting Sensitivity to light (photophobia) Sudden swelling (chemosis) Irritation Blindness in cats All cats are born with their eyelids fused shut, their eyelids begin to open around the second week of life. Aside from the above, which occurs in all newborn kittens, some cats will be born blind; others will become blind at a later stage in life either through disease or trauma. Blind cats can and do go on to live a full and happy life. More information on blindness in cats can be found here. Frequently asked questions Can cats control their pupils? Cats cannot consciously control their pupils; this is the role of the sympathetic nervous system for pupil dilation and the parasympathetic nervous system for pupil constriction. Can cats move their eyes? Yes, just like humans, cats can move their eyes from side to side and up and down.
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