This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to cure keratoconus naturally 
Manage your allergies, if you have any. 
If your eyes are itchy due to allergies, take an antihistamine regularly and avoid allergens. Additionally, you should try to manage any allergies you have, even if they don't directly affect your eyes.

Possible answers: I. Have a collection of questions handy, such as the following to figure out if you have a cause for your sensitivity. Are you allergic to your eyes? If you have seasonal allergies, bad eye conditions may cause the irritation.. II. Sleeping pills can also help your eyes, but if that's not an option for you, use pill vapor patches instead. Talk to your doctor about phenylalanine.. III. Soak your lenses to reduce your blink. Soaking the lenses in a gritty solution of water and soap will help to lower your irritability.. IV. Skin and food allergies might also cause eye inflammation and could be related to keratoconus. Drink more milk and take a calcium supplement..
The answer is:
IV.