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Fragile X syndrome (FXS) is a genetic neurodevelopmental disorder characterized by mild-to-moderate intellectual disability. The average IQ in males with FXS is under 55, while about two thirds of affected females are intellectually disabled. Physical features may include a long and narrow face, large ears, flexible fingers, and large testicles. About a third of those affected have features of autism such as problems with social interactions and delayed speech. Hyperactivity is common, and seizures occur in about 10%. Males are usually more affected than females.
Achromatopsia, also known as rod monochromacy, is a medical syndrome that exhibits symptoms relating to five conditions, most notably monochromacy. Historically, the name referred to monochromacy in general, but now typically refers only to an autosomal recessive congenital color vision condition. The term is also used to describe cerebral achromatopsia, though monochromacy is usually the only common symptom. The conditions include: monochromatic color blindness, poor visual acuity, and day-blindness. The syndrome is also present in an incomplete form that exhibits milder symptoms, including residual color vision. Achromatopsia is estimated to affect 1 in 30,000 live births worldwide.
Photophobia is a medical symptom of abnormal intolerance to visual perception of light. As a medical symptom, photophobia is not a morbid fear or phobia, but an experience of discomfort or pain to the eyes due to light exposure or by presence of actual physical sensitivity of the eyes, though the term is sometimes additionally applied to abnormal or irrational fear of light, such as heliophobia. The term photophobia comes from Greek φῶς (phōs) 'light' and φόβος (phóbos) 'fear'.
Visual snow syndrome (VSS) is an uncommon neurological condition in which the primary symptom is that affected individuals see persistent flickering white, black, transparent, or colored dots across the whole visual field.
Autism spectrum disorder (ASD) is a neurodevelopmental disorder that begins in early childhood, persists throughout adulthood, and affects any person in this way: social communication and restricted, repetitive patterns of behavior. There are many conditions comorbid to autism spectrum disorder, such as attention deficit hyperactivity disorder, anxiety disorders, and epilepsy.
Computer vision syndrome (CVS) is a condition resulting from focusing the eyes on a computer or other display device for protracted, uninterrupted periods of time and the eye's muscles being unable to recover from the constant tension required to maintain focus on a close object.
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.
Nonverbal learning disorder is a proposed category of neurodevelopmental disorder characterized by core deficits in non-verbal skills, especially visual-spatial processing. People with this condition have normal or advanced verbal intelligence and significantly lower nonverbal intelligence. A review of papers found that proposed diagnostic criteria were inconsistent. Proposed additional diagnostic criteria include intact verbal intelligence, and deficits in the following: visuoconstruction abilities, speech prosody, fine motor coordination, mathematical reasoning, visuospatial memory and social skills. NVLD is not recognised by the DSM-5 and is not clinically distinct from learning disorders.
Developmental disability is a diverse group of chronic conditions, comprising mental or physical impairments that arise before adulthood. Developmental disabilities cause individuals living with them many difficulties in certain areas of life, especially in "language, mobility, learning, self-help, and independent living". Developmental disabilities can be detected early on and persist throughout an individual's lifespan. Developmental disability that affects all areas of a child's development is sometimes referred to as global developmental delay.
A reading disability is a condition in which a person displays difficulty reading. Examples of reading disabilities include developmental dyslexia and alexia.
Neurodevelopmental disorders are a group of mental conditions affecting the development of the nervous system, which includes the brain and spinal cord. According to the American Psychiatric Association Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition, (DSM-5) published in 2013, these conditions generally appear in early childhood, usually before children start school, and can persist into adulthood. The key characteristic of all these disorders is that they negatively impact a person's functioning in one or more domains of life depending on the disorder and deficits it has caused. All of these disorders and their levels of impairment exist on a spectrum, and affected individuals can experience varying degrees of symptoms and deficits, despite having the same diagnosis.
High-energy visible light is short-wave light in the violet/blue band from 400 to 450 nm in the visible spectrum, which has a number of purported negative biological effects, namely on circadian rhythm and retinal health, which can lead to age-related macular degeneration. Increasingly, blue blocking filters are being designed into glasses to avoid blue light's purported negative effects. However, there is no good evidence that filtering blue light with spectacles has any effect on eye health, eye strain, sleep quality or vision quality.
Alström syndrome (AS), also called Alström–Hallgren syndrome, is a very rare autosomal recessive genetic disorder characterised by childhood obesity and multiple organ dysfunction. Symptoms include early-onset type 2 diabetes, cone-rod dystrophy resulting in blindness, sensorineural hearing loss and dilated cardiomyopathy. Endocrine disorders typically also occur, such as hypergonadotrophic hypogonadism and hypothyroidism, as well as acanthosis nigricans resulting from hyperinsulinemia. Developmental delay is seen in almost half of people with Alström syndrome.
Like Colour To The Blind (1996) is the third in a series of four autobiographical works by internationally bestselling autistic author Donna Williams.
Strephosymbolia was Samuel Orton's theory of dyslexia which he first published in 1925. The root strepho is Ancient Greek for "twisted" or "reversed" and he used this in preference to the phrase "word blindness", which he thought inaccurate as the difficulty was not that those with strephosymbolia could not see the words but that they had difficulty comprehending them. As he developed his theory, he attributed the difficulty to an imperfect dominance of the hemisphere of the brain which processed the symbols when reading, being confused by a residual but reversed equivalent in the other hemisphere.
Dyslexia is a reading disorder wherein an individual experiences trouble with reading. Individuals with dyslexia have normal levels of intelligence but can exhibit difficulties with spelling, reading fluency, pronunciation, "sounding out" words, writing out words, and reading comprehension. The neurological nature and underlying causes of dyslexia are an active area of research. However, some experts believe that the distinction of dyslexia as a separate reading disorder and therefore recognized disability is a topic of some controversy.
EnChroma are a brand of color corrective lenses designed to address the symptoms of red–green color blindness. Studies have shown that these lenses can alter the appearance of colors, but they do not restore normal color vision, and generally agree that they do not allow the wearer to see "new" colors, with some exceptions.
Severe intellectual disability-progressive spastic diplegia syndrome is a rare novel genetic disorder characterized by severe intellectual disabilities, ataxia, craniofacial dysmorphisms, and muscle spasticity. It is a type of autosomal dominant syndromic intellectual disability.
Color blind glasses or color correcting lenses are light filters, usually in the form of glasses or contact lenses, that attempt to alleviate color blindness, by bringing deficient color vision closer to normal color vision or to make certain color tasks easier to accomplish. Despite its viral status, the academic literature is generally skeptical of the efficacy of color correcting lenses.
References
- ↑ Cotton M, Evans K (1990). "A review of the use of Irlen (tinted) lenses". Australian and New Zealand Journal of Ophthalmology. 18 (3): 307–12. doi:10.1111/j.1442-9071.1990.tb00625.x. PMID 2261178.
- ↑ Miyasaka, Jordan Da Silva; Vieira, Raphael V. Gonzaga; Novalo-Goto, Elaine Shizue; Montagna, Erik; Wajnsztejn, Rubens (March 2019). "Irlen syndrome: systematic review and level of evidence analysis". Arquivos de Neuro-Psiquiatria. 77 (3): 194–207. doi: 10.1590/0004-282X20190014 . PMID 30970133. S2CID 108293945.
- ↑ LaBrot Z, Dufrene B (2019). "Chapter 5: Learning". In Hupp S (ed.). Pseudoscience in Child and Adolescent Psychotherapy: A Skeptical Field Guide. Cambridge University Press. pp. 66–79. doi:10.1017/9781316798096.007. ISBN 9781107175310. S2CID 240819473.
- ↑ Travers JC, Ayers K, Simpson RL, Crutchfield S (2016). "Fad, Pseudoscientific, and Controversial Interventions". In Lang R, Hancock T, Singh N (eds.). Early Intervention for Young Children with Autism Spectrum Disorder –Evidence-Based Practices in Behavioral Health. Springer. pp. 257–293. doi:10.1007/978-3-319-30925-5_9. ISBN 978-3-319-30923-1.
[We] consider this method to be a classic example of a commercial enterprise preying on vulnerable and desperate individuals in search of simple solutions for developmental disorders and disabilities
- 1 2 "Irlen Syndrome | Science-Based Medicine". 7 August 2013.
- ↑ "The University of Newcastle, Australia". The University of Newcastle, Australia. 13 November 2015. Archived from the original on 12 January 2007.