Your husband has developed paralysis
of right side of face that is why he is not able to blink and is having dryness of eyes. Facial nerve
controls muscles of our face and many diseases affecting it can cause such problems. You need to see a doctor (preferably neurologist
) on an emergency basis who would see him and start appropriate treatment. The treatment response is generally good in such cases. Physiotherapy
too would be needed along with medications. He should periodically close his eye using his hands. That would help in maintaining the eye moist. Artificial tear drops also will help similarly.