No, stress can't cause corneal ulcers. The reason why corneal ulcers happens is complicated. It can caused by external injury and infection which are the most common reasons. It can also caused by tuberculosis, rheumatism, syphilis, drstrophy and so on. Corneal ulcers is one of the most dangerous diseases to our eyes. If circumstance gets worse, you will become blind. Stress can't cause corneal ulcers at all. Stress can cause headache, nausea, stomachache, vomit, gasteremphraxis, high pressure and so on.