Optometrists can't handle every problem. It may be necessary in some cases for an optometrist to refer you to an ophthalmologist, a medical doctor who specializes in treating eye diseases and related conditions. In fact, your insurance might require such a referral before you can see the ophthalmologist.
If you're thinking about getting Lasik surgery for your eye problems, talk it over with your optometrist first. They can help you determine whether you're a good candidate for the surgery, and they can also provide you the recommendations and referrals that you need.