vision therapy vision therapy vision therapy (vt), or behavioral optometry, is an umbrella term for alternative medicine treatments using eye exercises, based around the pseudoscientific claim that vision problems are the true underlying cause of learning difficulties, particularly in children. vision therapy has not been shown to be effective using scientific studies, except for helping with convergence insufficiency. most claims—for example that the therapy can address neurological, educational, and spatial difficulties—lack supporting evidence. neither the american academy of pediatrics nor the american academy of ophthalmology support the use of vision therapy. vision therapyspecialtyoptometry this article is part of a series onalternative medicine general information alternative medicine history terminology alternative veterinary medicine quackery (health fraud) rise of modern medicine pseudoscience antiscience skepticism scientific therapeutic nihilism fringe medicine and science acupressure acupuncture alkaline diet anthroposophic medicine apitherapy applied kinesiology aromatherapy association for research and enlightenment auriculotherapy bates method black salve bodywork bone-setting bowen technique breathwork camel urine fake covid-19 treatments cancer treatments charcoal cleanse chelation therapy chiropractic chiropractic treatment techniques vertebral subluxation christian science chromotherapy colon cleansing coffee enema colorpuncture colloidal silver craniosacral therapy crystal healing cupping therapy dental amalgam controversy detoxification foot detox dry needling ear candling energy medicine correactology esoteric energy therapeutic touch estrogen dominance fabunan antiviral injection facilitated communication feldenkrais method functional medicine hair analysis herbal medicine holistic dentistry hologram bracelet homeopathy bach flower remedies biological terrain assessment hydrotherapy hypnotherapy iridology ionized jewelry jilly juice lightning process lymphotherapy medical intuitive mesmerism magnet therapy manual therapy megavitamin therapy mind–body interventions mms myofascial release naet naturopathy oil pulling orgone orthomolecular medicine orthopathy osteomyology osteopathy ozone therapy parapsychology phrenology postural integration psychic surgery psychodermatology quantum healing radionics rapid prompting method rbop reiki reflexology rolfing scientific racism thetahealing thought field therapy urophagia vaginal steaming vision therapy vitalism vegetotherapy young blood transfusion zero balancing conspiracy theories big pharma conspiracy theories hiv/aids denialism opv aids hypothesis anti-vaccinationism in chiropractic vaccines and autism mmr vaccine and autism water fluoridation controversy covid-19 misinformation classifications alternative medical systems mind–body intervention biologically-based therapy manipulative methods energy therapy traditional medicine african muti southern africa ayurveda dosha mvah balneotherapy brazilian bush medicine cambodian chinese blood stasis chinese herbology dit da gua sha gill plate trade meridian moxibustion pressure point qi san jiao tui na zang-fu chumash curandero faith healing hilot iranian jamu kambo japanese korean mien shiang mongolian prophetic medicine shamanism shiatsu siddha sri lankan thai massage tibetan unani vietnamese diagnoses adrenal fatigue aerotoxic syndrome candida hypersensitivity chronic lyme disease electromagnetic hypersensitivity heavy legs leaky gut syndrome multiple chemical sensitivity wilson's temperature syndrome definition and conceptual basis vision therapy is based on the proposition that many learning disabilities in children are based on vision problems, and that these can be cured by performing eye exercises. vision therapy lacks sound evidence, has been characterized as a pseudoscience and its practice as quackery. vision therapy is a broad concept that encompasses a wide range of treatment types. these include those aimed at convergence insufficiency – where it is often termed "vergence therapy" or "orthoptic therapy" – and at a variety of neurological, educational and spatial difficulties. efficacy there is no good evidence that it is of any benefit in treating learning disabilities, reading, dyslexia, or adhd, although there is some evidence that vision therapy may help treat convergence insufficiency in healthy people. as of 2020 the consensus among ophthalmologists, orthoptists and pediatricians is that non-strabismic visual therapy lacks documented evidence of effectiveness. a review in 2000 concluded that there were insufficient controlled studies of the approach. a 2008 review of the literature also noted that there were insufficient controlled studies, and concluded that the approaches "are not evidence-based, and thus cannot be advocated." treatment types there exist a few different broad classifications of vision treatment philosophies, which have been traditionally divided between optometrists, ophthalmologists, and practitioners of alternative medicine. orthoptic vision therapy, also known as orthoptics, is a field pertaining to the evaluation and treatment of patients with disorders of the visual system with an emphasis on binocular vision and eye movements. commonly practiced by orthoptists, optometrists, behavioral optometrists, pediatric ophthalmologists, and general ophthalmologists, traditional orthoptics addresses problems of eye strain, visually induced headaches, strabismus, diplopia and visual-related skills required for reading. behavioral vision therapy, or visual integration vision therapy (also known as behavioral optometry). there have been a number of alternative vision therapy approaches which have not been studied in traditional or evidence-based medicine. they are commonly provided by unlicensed professionals, although a minority of optometrists also provide them. these methods are commonly under scrutiny by ophthalmological and optometric journals for lack of proven effectiveness. orthoptic vision therapy main article: orthoptics orthoptics emphasises the diagnosis and non-surgical management of strabismus (wandering eye), amblyopia (lazy eye), and eye movement disorders. evidence to support its use in amblyopia is unclear as of 2011. much of the practice of orthoptists concerns refraction and muscular eye control. orthoptists are trained professionals who specialize in orthoptic treatment. with specific training, in some countries orthoptists may be involved in monitoring some forms of eye disease, such as glaucoma, cataract screening, and diabetic retinopathy. behavioral vision therapy behavioral vision therapy (bvt) aims to treat problems including difficulties of visual attention and concentration, which behavioral optometrists classify as visual information processing weaknesses. these manifest themselves as an inability to sustain focus or to shift focus from one area of space to another. some practitioners assert that poor eye tracking may impact reading skills, and suggest that vision training may improve some of the visual skills helpful for reading. behavioral vision therapy is practiced primarily by optometrists who specialize in the area. historically, there has been some difference in philosophy among optometry and medicine regarding the efficacy and relevance of vision therapy, although none support its use in treating learning disorders. major organizations, including the international orthoptic association and the american academy of ophthalmology, have concluded that there is no validity for clinically significant improvements in vision with bvt, and therefore do not practice it. however, major optometric organizations, including the american optometric association, the american academy of optometry, the college of optometrists in vision development, and the optometric extension program, support the assertion that non-strabismic visual therapy does address underlying visual problems which are claimed to affect learning potential. these optometric organizations are careful to distinguish, though, that vision therapy does not directly treat learning disorders. behavioral optometry behavioral optometry is a scientifically unproven branch of optometry that explores how visual function influences a patient's day-to-day activities. vision therapy is a subset of behavioral optometry. in general, vision therapists attempt to improve the vision, and therefore day-to-day well-being, of patients using "eye exercises," prism, and lenses, with more emphasis on the patient's visual function. among schools of medicine, ophthalmology does not see merit in the procedures surrounding many of behavioral optometry's practices, as there have not been enough studies of high enough rigor to warrant practicing vision therapy. according to the american association for pediatric ophthalmology and strabismus, the behavioral aspects of vision therapy are considered scientifically unproven. techniques in 2008, vision scientist brendan barrett published a review of behavioral optometry at the invitation of the uk college of optometrists. he wrote that behavioral optometry was not a well-defined field but that proponents believed it could go beyond standard programmes, like an extension to optometry, taking a holistic approach. barrett enumerated the therapies: vision therapy for accommodation/vergence disorders – eye exercises and training to try and alleviate these disorders. there is evidence that convergence disorders may be helped by eye exercises, but no good evidence exists that exercises help with accommodation disorders. the underachieving child – therapies claimed to help children with dyslexia, dyspraxia and attention deficit disorder – a "vulnerable" target market. there is no evidence that behavioral optometry is of any benefit in relation to these conditions. prisms for near binocular disorders and for producing postural change – the use of "yoked" prisms to redirect a person's gaze and bring about a range of claimed benefits including postural improvements and increased wellbeing. there is a lack of evidence for the effect this approach may have. near point stress and low-plus – the use of special lenses to adjust near-field vision, even for people who would not normally need glasses. this is claimed to bring about postural benefits and relieve visual stress. some research has been carried out in this area and its effectiveness remains "unproven". use of low-plus lenses at near to slow the progression of myopia. therapy to reduce myopia. behavioural approaches to the treatment of strabismus and amblyopia. training central and peripheral awareness and syntonic. sports vision therapy. neurological disorders and neurorehabilitation after trauma/stroke. barrett noted the lack of published controlled trials of the techniques. he found that there are a few areas where the available evidence suggest that the approach might have some value, namely in the treatment of convergence insufficiency, the use of yoked prisms in neurological patients, and in vision rehabilitation after brain disease or injury—but he found that in the other areas where the techniques have been used, i.e., the majority of situations, there is no evidence of their value. in contrast, steven novella points out that the only condition for which there is good quality scientific evidence is convergence disorders. this points out a problem that is common with complementary or integrative medicine, a type of alternative medicine, is that a promising use for treating a single disorder is applied to a wide range of disorders for which there is no evidence. eye exercises the eye exercises used in vision therapy can generally be divided into two groups: those employed for "strabismic" outcomes and those employed for "non-strabismic" outcomes, to improve eye health. ophthalmologists and orthoptists do not endorse these exercises as having clinically significant validity for improvements in vision. usually, they see these perceptual-motor activities being in the sphere of either speech therapy or occupational therapy. some of the exercises used are: near the point of convergence training, or the ability for both eyes to focus on a single point in space. base-out prism reading, stereogram cards, computerized training programs are used to improve fusional vergence. the wearing of convex lenses. the wearing of concave lenses. "cawthorne cooksey exercises" also employ various eye exercises, however, these are designed to alleviate vestibular disorders, such as dizziness, rather than eye problems. antisuppression exercises for amblyopia - this is no longer commonly practiced, although occasionally it may be used. eye exercises used in behavioural vision therapy, also known as developmental optometry, aim to treat problems, including difficulties of visual attention and concentration, which may manifest themselves as an inability to sustain focus or to shift focus from one area of space to another. some of the exercises use: marsden balls rotation trainers syntonics balance board or beams saccadic fixators directional sequencers fusional amplitude and relative fusional amplitude training are designed to alleviate convergence insufficiency. the citt study (convergence insufficiency treatment trial) was a randomized, double-blind multi-center trial (high level of reliability) indicating that orthoptic vision therapy is an effective method of treatment of convergence insufficiency (ci). both optometrists and ophthalmologists were coauthors of this study. fusional amplitude training is also designed to alleviate intermittent exotropia and other less common forms of strabismus. certain do-it-yourself eye exercises are claimed by some to improve visual acuity by reducing or eliminating refractive errors. such claims rely mainly on anecdotal evidence, and are not generally endorsed by orthoptists, ophthalmologists or optometrists. the german optician hans-joachim haase developed a method to correct an alleged misalignment. his method, called the mkh method, is not recognized as an evidence-based approach. conceptual basis and effectiveness behavioral optometry is largely based on concepts that lack plausibility or which contradict mainstream neurology, and most of the research done has been of poor quality. as with chiropractic, there seems to be a spectrum of scientific legitimacy among practitioners: at one extreme there is some weak evidence in support of the idea that myopia may be affected by eye training; at the other extreme are concepts such as "syntonic phototherapy" which proposes that differently colored lights can be used to treat a variety of medical conditions. a review in 2000 concluded that there were insufficient controlled studies of the approach. in 2008 barrett concluded that "the continued absence of rigorous scientific evidence to