Keratitis is an inflammation of the cornea which can be caused by bacteria, viruses, amoeba and fungus. Candida can be one of the fungus that causes Keratitis, and it is rare, but not something to take lightly. Anything that affects your eyes and your vision should not be joked around with, and must be taken very seriously.
The CDC says that Fungal Keratitis can cause blindness if left untreated http://www.cdc.gov/fungal/fungal-keratitis/symptoms.html. So be sure to look for the right symptoms and if you notice them, head to an eye doctor immediately. The symptoms to watch out for would be Eye pain and redness, blurred vision, sensitivity to light, and excessive tearing or discharge coming out of the eyes.
If you go to the doctor and he diagnoses you with Candida Keratitis, I cannot with good reason tell you not to use the medicine that they prescribe to you. The only thing thing I can say is that you must do what you can on your part to ensure it doesn’t happen again. This is not just about treatment, but about prevention. Make sure when you go into climates where you can get Candida, that you wear proper eye equipment. That you keep a healthy immune system, and just keep clean in general. That means don’t do things like rub your own eyes with your dirty hands which you’ve been out all day with and didn’t wash it.
Fungal Keratitis is pretty serious if you get it, but it can be cured. You must keep a healthy body and mind, as well as following the doctor’s regimen. If he tells you to use the eye drops 3 times a day, you probably should as you do not want to mess with the eyes. The most important thing I can tell you is that you already have a super low chance of ever getting it, but if you take precautions and stay clean, don’t touch your eyes, wear protective glasses when you go to an area that you can get it, and always clean your glasses, the odds of you ever getting Candida Keratitis is very low.