Aqueous Humor

According to wikipedia, the aqueous humour is "a clear, gelatinous fluid similar to plasma, but containing low-protein concentrations." It is located behind the cornea of the eye, and in front of the lens and main section of the eyeball which contains the vitreous humor.

It is responsible for the intraocular pressure of the eye (and thus is connected to glaucoma issues) and inflates the cornea of the eye. It helps provide nutrients to the front of the cornea and the front of the eye.