Write an article based on this "Understand what a corneal ulcer is. Learn about hereditary cataracts. Understand how breeding practices can increase or decrease the chances of eye problems."

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The cornea is the transparent capsule on the front portion of the eye globe, through which light passes to reach the lens and pass onward to the retina. Think of it like a clear skin over the eye (that is the full thickness of the globe). The cornea is actually made up of stacks of clear cells, arranged in layers, much like bricks in a wall. An ulcer is like a burst blister on the skin of the eye or an erosion or crater sitting on the surface of the eye.  In the case of the Boston terrier, the ulcer may develop because of a problem called corneal dystrophy. This is a problem where the glue holding the cells together fails, like not enough mortar between the bricks. This allows sheets of cells to lift up and peel away. Corneal ulcers are painful. If they erode too deeply the eyeball is severely weakened and it can burst, causing the dog to lose that eye. A cataract refers to a cloudiness of the lens. The lens is the structure which focuses light on the retina. It is a transparent sack of jelly and sits just behind the colored part of the eye, the iris. It is a genetic condition that can cause a cataract to develop at as young as 12 months of age.  Juvenile cataracts can develop distressingly quickly, sometimes in as little as 24 hours. If the cataract is very dense, you see a bright white object sitting in the middle of the eye, where the black pupil normally is.  It is thought that one in 10 Boston terriers will suffer from this condition during their life.  Sudden formation of a juvenile cataract is sometimes associated with inflammation within the eye, so the eye is sore and inflamed. If the cataract is very dense it blocks the passage of light, and although the retina is healthy, the dog is blind because the light is prevented from penetrating that deep into the eye. Part of the reason that Boston terriers, and other purebred dogs, have so many eye problems is because dogs that have these problems already are being bred with each other. It increases the likelihood of these conditions if one or both parents have a genetic condition already. Fortunately, if good breeding practices are observed (for instance not breeding dogs with these conditions) the issues could be reduced greatly.  For example, there is now a genetic screening test available for juvenile cataracts. In the case of juvenile cataracts, prevention is better than a cure. If all breeding stock were screened, and only negative dogs were bred, the problem could be brought under control. When you adopt a dog from a breeder, as to see the medical records of the dog's parents. If they have had proper veterinary care and have been screened for eye problems, then the chances that your prospective dog will have eye problems are much lower.