Keeping a pet cat puts owners at greater risk of going blind, a UCLA study has found, but it seems a dog in the household may protect eyesight, the Telegraph reports.
The study found that dogs and cats carry antigens that can prompt different immune responses in humans.
The allergen that dogs carry reduces the chance of developing glaucoma, but owning a cat nearly doubles the risk of contracting the disease.
The study found that cat owners who reacted to their pet allergen had a 90 percent increased risk of glaucoma compared with non-pet owners; but dog owners were 20 percent less likely to develop the condition.
The question the study did not answer: if you own a cat and a dog, do the allergens of both animals cancel each other out?
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