is however generally used in patients who need visual correction but for whom the corrective lenses are not enough to reverse the condition. Visual therapy in children is performed by optometrists who specialize in children's eye care. To specialize in vision therapy, doctors must complete extensive post-graduate training beyond their optometric degree, at which time they are eligible to sit for their national boards to become fully certified as specialists in children's vision. A doctor's title after passing the national board in vision therapy is Fellow in the College of Optometrists in Vision Development, or F.C.O.V.D. Optometrists who provide vision therapy but who have not yet sat for their certification exams are board-eligible Associates in the College of Optometrists in Vision Development. Vision therapists typically use prisms, eye patches, filtered lenses, and computerized systems to conduct therapy sessions. Most eye care professionals do not practice iridology, citing a significant lack of scientific evidence for the practice. Distinction between Ophthalmologists, Optometrists and Orthoptists Ophthalmologists generally provide specialty eye care and manage late stage eye disease (often only mitigated with surgery). Optometrists typically provide comprehensive eye care - including medical, up to a moderate stage (managed with prescription medications). There is considerable overlap in scope of practice between professions. Optometrists are licensed to provide exactly the same medical care as ophthalmologists, but not invasive surgery. Orthoptists specialize in the diagnosis and management of problems with eye movement and coordination, such as misalignment of the visual axis, binocular vision problems, and pre/post surgical care of strabismus patients. They do not directly treat ocular disease with medications or surgery. Orthoptists are trained to treat patients using optical aids and eye exercises. Orthoptists are primarily found working alongside ophthalmologists and optometrists to co-manage binocular vision treatment, visual field loss management and accommodative therapy. They often do standard eye and vision testing along with computerised axillary testing. All three types of professional perform screenings for common ocular problems affecting children (such as amblyopia and strabismus) and adults (such as cataracts, glaucoma, and diabetic retinopathy). All are required to participate in ongoing continuing education courses to maintain licensure and stay current on the latest standards of care. See also American Academy of Ophthalmology American Academy of Optometry American Association for Pediatric Ophthalmology and Strabismus American Optometric Association British Optical Association College of Optometrists College of Optometrists in Vision Development International Orthoptic Association Irish College of Ophthalmologists Joint