answer:Dr. of Ophthalmlogy has been to Med School and will test for cataracts, macular degeneration, floaters,detached retinas,and other nasty eye problems -along with checking and correcting your Rx. Expensive (since he has been to Med. School.) Optomotrists are also trained to do the above but can’t do the surgery if necessary. An optician is an eye care professional who provides corrective lenses based on a refraction prescription supplied by a ophthalmologist or optometrist. ...(wickipedia) I think that Lenscrafters sell frames, fill Rx, and fit glasses only.