visual distortion upon wakening

This has happened 2-3 times so far.  When I wake up my vision is distorted in one eye; when I put on my glasses I cannot see well; the first time I thought I had fallen asleep with my contacts on.  After several minutes or at the most maybe 5-7 minutes, it disappears.  The timing is well spaced; this just happened but the last time was about 3 months ago.  I had it checked with an eye doctor but he said he could not find a problem.  Could this be due to something more involved and unrelated to the eyes?  Thank you.

[John C Hagan III, MD, FACS, FAAO]

Your problem is likely due to swelling of the cornea while you are asleep ("corneal edema") this can be due to poorly fitting contacts or disease of the cornea. See an Eye MD ophthalmologist to get an exact diagnosis.  Find one at www.aao.org

JCH MD