Yes, a unilateral loss of vision is call amaurosis fugax and can be a prelude to a stroke. However, it is not clear to me what you mean by loss of focus. You should see an EyeMD.
Dr. O.
Thanks for your reply. I will book an appointment with my optometrist. By lack of focus I do not mean loss of vision. I can still see but nothing is in focus. It's like I see a total blur and I try with all my effort to refocus and it eventually regains focus. My left eye feels weird a lot in that it feels like it could once again go out of focus almost any time. When these "spells" occur I feel like my eyeball is moving around but I don't think it is although I've never had the chance to look in the mirror when it is happening. Please let me know if you have anymore thoughts and I appreciate your help.