I am having a similar issue, although I am on a higher dose. It is a very common and normal side-effect of accutane. Consider trying a gel eye-lubricant if you haven't already (Systane makes a pretty good one). Also, there are very thick ointments you can use at night (they make your vision a little blurry because they are so thick, so you don't want to use them during the day if you can help it) that can be very helpful by keeping your eyes moisturized over-night. Look for
lubricating eye *ointment*, it's kind of like aquaphor for your eyes. If you wear contacts, switching to glasses might help.
I am sure you already know this, but just in case- DO NOT use the drops that are meant to clear "red eyes" like Visine, etc. These drops actually make your eyes dryer and redder, and are not a helpful lubricant. Make sure you are using drops designed specifically to be artificial tears. If it continues to be bothersome (your eyes will continue to be dry anyway on accutane, so keep that in mind) or you experience any loss of vision or unexplained blurryness, go to an eye doctor.