What kind of professional is primarily involved in the fitting of eyeglasses?

The fitting of eyeglasses is primarily conducted by an optician. Opticians are trained to dispense, fit, and adjust eyewear according to the prescriptions provided by optometrists or ophthalmologists. They possess the technical skills required to measure the patient's face, align the frames properly, and ensure that the lenses fit correctly within the frames for optimal vision correction.

Understanding the roles within the eye care field helps distinguish the responsibilities of each professional. An optometrist primarily conducts eye exams and prescribes lenses or medications for vision problems. An ophthalmologist is a medical doctor specializing in eye diseases and surgical procedures but may not be directly involved with fitting eyeglasses. An ocularist specializes in artificial eyes or ocular prosthetics and does not typically deal with regular vision correction through glasses. Thus, the role of the optician is singularly focused on the fitting and dispensing of eyeglasses, making it the correct answer.