Green eyes may be caused by glaucoma, fluorescein sodium residue, Pseudomonas aeruginosa infection and so on. 1. Glaucoma: If you suffer from glaucoma, your intraocular pressure will gradually increase, which will cause corneal edema and decrease the transparency of the cornea. At this time, if the light passes through the cornea, there may be scattering, and the reflected light mostly shows greenish color, which can be seen from the appearance of green eyeballs. 2. Fluorescein sodium residue: some eye examinations, such as corneal staining test, etc., will use fluorescein sodium, if the use of improper dosage control, may cause the conjunctival sac fluorescein sodium residue, thus causing green eyes. 3. Pseudomonas aeruginosa infection: If the conjunctiva or cornea is infected with Pseudomonas aeruginosa, the metabolites of Pseudomonas aeruginosa may cause greening of the eyeballs. If you have green eyes, you should go to the hospital in time for examination to clarify the cause of the disease and carry out targeted treatment as soon as possible to prevent the symptoms from aggravating and causing other eye problems.