Temporary Flashing Lights

I've been experiencing some flashing lights in my left peripheral vision lately.  The flashing comes and lasts for about 15 minutes, and it only happens about once every 2 weeks (not always that often).  I rub my eye and it appears as if there is a slight discharge of tears.  I don't know whether this discharge is the result of simply rubbing or if it is due to a build up of moisture.  Regardless, the lights tend to go away after the discharge of tears.  My right eye is completely fine.  Do I need to worry about this?  I have reading glasses with a very slight correction, but my vision is fine otherwise.  

Thanks for your time.

[Ray T Oyakawa, MD]

Yes, you should be concerned.  See an ophthalmologist.

Dr. O.