I have had 4 cornea abrasions since my PRK surgery a year and a half ago. PLEASE HELP !

Since then, I have had a total of 4 cornea abrasions between both eyes. Every night before bed, I put Muro128 ointment on my water-line so my eyes stay lubricated (the abrasion usually occurs when I open my eyes in the morning). I also have trained myself not to open my eyes when I first wake up without putting in wetting drops in each eye. I feel like I am doing everything possible yet this is still continuing to happen to me.My eye doctor has really been great helping me understand what is happening and what steps are appropriate for me. The last time I had an abrasion on my right eye (2 months ago) I wore a bandage contact for 4 weeks. For me wearing a contact over night would eliminate this problem I am having since each abrasion I have had has happened over night.