The Tibetan eye chart is a tool allegedly developed by Tibetan monks. [ unreliable source? ] [ unreliable source? ] [ unreliable source? ] According to some authors, it can be used to train the muscles and nerves of the optical system, correcting visual problems. [ unreliable source? ] [ unreliable source? ] However, the International Orthoptic Association has found no scientific evidence of the effectiveness of this treatment. [ verification needed ]
Chakras are the various focal points in the subtle body used in a variety of ancient meditation practices, collectively denominated as Tantra, or the esoteric or inner traditions of Hinduism.
An eyepatch is a small patch that is worn in front of one eye. It may be a cloth patch attached around the head by an elastic band or by a string, an adhesive bandage, or a plastic device which is clipped to a pair of glasses. It is often worn by people to cover a lost or injured eye, but it also has a therapeutic use in children for the treatment of amblyopia (See orthoptics and vision therapy). Eyepatches used to block light while sleeping are referred to as a sleep mask. Eyepatches associated with pirates are a stereotype originating from fiction.
Peripheral vision, or indirect vision, is vision as it occurs outside the point of fixation, i.e. away from the center of gaze. The vast majority of the area in the visual field is included in the notion of peripheral vision. "Far peripheral" vision refers to the area at the edges of the visual field, "mid-peripheral" vision refers to medium eccentricities, and "near-peripheral", sometimes referred to as "para-central" vision, exists adjacent to the center of gaze.
The visual system is the part of the central nervous system which gives organisms the ability to process visual detail as sight, as well as enabling the formation of several non-image photo response functions. It detects and interprets information from visible light to build a representation of the surrounding environment. The visual system carries out a number of complex tasks, including the reception of light and the formation of monocular representations; the buildup of a nuclear binocular perception from a pair of two dimensional projections; the identification and categorization of visual objects; assessing distances to and between objects; and guiding body movements in relation to the objects seen. The psychological process of visual information is known as visual perception, a lack of which is called blindness. Non-image forming visual functions, independent of visual perception, include the pupillary light reflex (PLR) and circadian photoentrainment.
The cornea is the transparent front part of the eye that covers the iris, pupil, and anterior chamber. The cornea, with the anterior chamber and lens, refracts light, with the cornea accounting for approximately two-thirds of the eye's total optical power. In humans, the refractive power of the cornea is approximately 43 dioptres. The cornea can be reshaped by surgical procedures such as LASIK.
The Bates method is an ineffective alternative therapy aimed at improving eyesight. Eye-care physician William Horatio Bates, M.D. (1860–1931) attributed nearly all sight problems to habitual strain of the eyes, and felt that glasses were harmful and never necessary. Bates self-published a book, Perfect Sight Without Glasses, as well as a magazine, Better Eyesight Magazine, detailing his approach to helping people relax such "strain", and thus, he claimed, improve their sight. His techniques centered on visualization and movement. He placed particular emphasis on imagining black letters and marks, and the movement of such. He also proposed that exposing the eyes to sunlight would help alleviate the "strain".
Orthoptics is a profession allied to the eye care profession whose primary emphasis is the diagnosis and non-surgical management of strabismus, amblyopia and eye movement disorders. The word orthoptics comes from the Greek words ὀρθός orthos, "straight" and ὀπτικός optikοs, "relating to sight" and 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 of some forms of eye disease, such as glaucoma, cataract screening and diabetic retinopathy
A flowchart is a type of diagram that represents a workflow or process. A flowchart can also be defined as a diagrammatic representation of an algorithm, a step-by-step approach to solving a task.
Visual acuity (VA) commonly refers to the clarity of vision. Visual acuity is dependent on optical and neural factors, i.e., (i) the sharpness of the retinal focus within the eye, (ii) the health and functioning of the retina, and (iii) the sensitivity of the interpretative faculty of the brain.
Diplopia is the simultaneous perception of two images of a single object that may be displaced horizontally, vertically, diagonally, or rotationally in relation to each other. It is usually the result of impaired function of the extraocular muscles, where both eyes are still functional, but they cannot turn to target the desired object. Problems with these muscles may be due to mechanical problems, disorders of the neuromuscular junction, disorders of the cranial nerves that innervate the muscles, and occasionally disorders involving the supranuclear oculomotor pathways or ingestion of toxins.
The human eye is an organ that reacts to light and allows vision. Rod and cone cells in the retina allow conscious light perception and vision including color differentiation and the perception of depth. The human eye can differentiate between about 10 million colors and is possibly capable of detecting a single photon. The eye is part of the sensory nervous system.
Kum Nye and sKu-mNyé are a wide variety of Tibetan religious and medical body practices. The two terms are different spellings in the Latin alphabet of the same Tibetan phrase, which literally means "massage of the subtle body". Some systems of sku mnye are vaguely similar to Yoga, T'ai chi, Qigong, or therapeutic massage. "Kum Nye", Ku Nye, and Kunye are also used to transcribe the Tibetan phrases dku mnye and bsku mnye, which are pronounced identically to sku mnye. dKu mnye and bsku mnye manipulate the physical body, rather than the subtle (energetic) one.
The accommodation reflex is a reflex action of the eye, in response to focusing on a near object, then looking at a distant object, comprising coordinated changes in vergence, lens shape (accommodation) and pupil size. It is dependent on cranial nerve II, superior centers (interneuron) and cranial nerve III. The change in the shape of the lens is controlled by the ciliary muscles inside the eye. Changes in contraction of the ciliary muscles alter the focal distance of the eye, causing nearer or future images to come into focus on the retina; this process is known as accommodation. The reflex, controlled by the parasympathetic nervous system, involves three responses: pupil constriction, lens accommodation, and convergence.
The Five Tibetan Rites is a system of exercises reported to be more than 2,500 years old which were first publicized by Peter Kelder in a 1939 publication titled The Eye of Revelation.
Vision therapy (VT) is an umbrella term for a variety of treatments based around eye exercises. The treatments aim to treat convergence insufficiency – for which there is supporting evidence – and a range of neurological, educational and spatial difficulties – uses which are not supported by good evidence.
A vergence is the simultaneous movement of both eyes in opposite directions to obtain or maintain single binocular vision.
Convergence insufficiency is a sensory and neuromuscular anomaly of the binocular vision system, characterized by a reduced ability of the eyes to turn towards each other, or sustain convergence.
An eye care professional (ECP) is an individual who provides a service related to the eyes or vision. It is any healthcare worker involved in eye care, from one with a small amount of post-secondary training to practitioners with a doctoral level of education.
"Eyesight to the Blind" is a 12-bar blues song written and recorded in 1951 by Sonny Boy Williamson II. He also recorded the related songs "Born Blind", "Unseeing Eye", "Don't Lose Your Eye", and "Unseen Eye" during his career. The Larks, an American rhythm and blues group, recorded the song, which reached number five on the R&B charts in 1951. Several musicians subsequently recorded it in a variety of styles. The Who used Williamson's lyrics for their adaptation for the rock opera Tommy.
Representational systems (also known as sensory modalities and abbreviated to VAKOG is a postulated model from neuro-linguistic programming a pseudoscientific collection of models and methods regarding how the human mind processes and stores information. The central idea of this model is that experience is represented in the mind in sensorial terms, i.e. in terms of the putative five senses, qualia.