I wear glasses but my left eye is still blurry with them on. what could be the problem because my prescription is up to date?

Recheck needed: One of the following is possible: 1) the prescription was wrong (the responses in the office are subjective) 2) the one lens was made wrong (most optical shops give you a two month window for a remake with no charge) 3) some change occurred in the one eye (unlikely unless you took a long time to get the glasses made). Re check with your ophthalmologist.