Mature vs immature cataract

A dog has a clear lens in its eyes to help him focus, similar to a camera. Much like humans, cataracts in dogs is serious and can potentially be painful. Cataracts in dogs are a disease that clouds the lens of the eye. Smaller cataracts in dogs typically do not impact vision as much larger cataracts; however, all cataracts in dogs must be closely monitored to prevent loss of vision and blindness.

Cataracts in Dogs: Stages, Causes, Treatments, And More

Lens - Eye Diseases and Disorders - Veterinary Manual

A cataract is a clouding of the lens in the eye which leads to a decrease in vision. Cataracts are most commonly due to aging but may also occur due to trauma or radiation exposure, be present from birth , or occur following eye surgery for other problems. Prevention includes wearing sunglasses and avoiding smoking. About 20 million people are blind due to cataracts. Signs and symptoms vary depending on the type of cataract, though considerable overlap occurs. People with nuclear sclerotic or brunescent cataracts often notice a reduction of vision. Nuclear cataracts typically cause greater impairment of distance vision than of near vision.

The relationship of cataract maturity to intraocular pressure in dogs.

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One of the most rewarding things for a veterinary ophthalmologist is to be able to perform cataract surgery on a blind animal and then witness the restored vision and delight that this delivers to both pet and owner. However, not all cataract surgeries will have that outcome, particularly in the long term. Complications can arise meaning vision is not restored, or more commonly is restored and then lost. In making the decision of when to perform cataract surgery for the best outcome there are several factors that need to be considered.
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