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I too would sit and watch. It's not uncommon for lions to have popeye and you can see it's as clear as a marble.
Gas bubble disease
This syndrome more typically produces gas bubbles on the body of seahorses, (including the male's brood pouch) but can also involve the skin around the eyes. The cause of this problem is not well known, and only experimental treatments have been proposed. Injections with acetazolamide at around 5mg per kg have shown promise in treating this disease, but that treatment is an off-label use of the drug, and outside the ability of most home aquarists to perform. Many aquarists have attributed this syndrome to supersaturation of the water with gas - making it an environmental condition (covered in the next section). However, it has been repeatedly shown that gas bubble disease can infect seahorses in aquarium systems that are not undergoing supersaturation, so the cause of the problem must be found elsewhere.

