Anthony,
Sorry to hear you have Accutane induced dry eye. It seems that dry eye from Lasik and Accutane use causes more extreme dry eye than typical.
If you are off of the Accutane, you may want to try Long Chain Polyunsaturated fatty acids. In your case you're going to have to use higher doses in 2 gram to 3 gram per day level and you'll have to have a blend of LCP's to reduce the dryness from lack of oils in your skin and other glands.
I've posted a lot of information on LCP's at this link.
http://www.dryeyezone.com/talk/showthread.php?t=12810
There are three posts in that thread which explain a lot about LCP function in the body. In your case I would definitely try to find a compounding pharmacy that could make you a 0.2% sterile solution of alpha linolenic acid drops you can use directly into the eyes. I think you probably have corneal epithelial cell damage along with other things. Corneal epithelial cell damage is like having a large corneal abrasion that never heals. That can cause a lot of pain, especially if it is over a significant portion of the cornea, which it is likely to be after Accutane use.
If you have E cell damage, moving your eyes up or down can increase the pain. In addition, any eye strain will increase the pain.
Vitamin E, D and C are also important to healing E cell damage. Vit E 400 mg a day for a month, and then 200 mg a day after. About a 1000 mg of Vit C a day is adequate at your age. And 2000 mg of Vit D a day is also adequate in your age group.
It will take 20 weeks for the oral LCP's and vitamins to reach their effective levels. LCP's don't have a half life like a vitamin or medication. They are stored in the cells and it takes time for the cells to accumulate maximum levels.
The eye drops work faster, if you can get a compounding pharmacy to make it for you. They have to have the ability to sterilize solutions and that requires expensive hoods, etc so not many compounding pharmacies are around that can do that now days. If you live near a pharmacy school, one of the professors might be able to help you get some, but be prepared for a lot of frustrating brush offs.
Some Accutane users have had success with GenTeal Lubricant eye gel used at night. If it causes burning, it's probably from the E cell issues.
Another thing that seems to help is spending time in wet steam rooms. The moist heat helps the cells rehydrate and that helps them heal. It also reduces inflammation. If you have access to the wet steam room, give it a try in the afternoon or evening maybe a half hour before you study.
I hope some of that works for you.