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Post-traumatic stress disorder (PTSD) People with PTSD are prone to sensory overload due to a general hypersensitivity to sensory stimuli partially caused by sensory gating issues; this is supported by the fact that people with PTSD have impaired P50 gating and an inability to filter redundant auditory stimuli.
The responses can have a variety of causes, from an involuntary reflex reaction to exposure or inexposure to light—in low light conditions a dilated pupil lets more light into the eye—or it may indicate interest in the subject of attention or arousal, sexual stimulation, [4] uncertainty, [5] decision conflict, [6] errors, [7] physical ...
Accommodative insufficiency (AI) involves the inability of the eye to focus properly on an object. Accommodation is the adjustment of the curvature of the lens to focus on objects near and far. In this condition, amplitude of accommodation of a person is lesser compared to physiological limits for his age. [ 1 ]
Eyes described as γλαυκός due to disease might have had a gray cataract in the Hippocratic era, or, in the early Common Era, the greenish pupillary hue sometimes seen in angle-closure glaucoma. [111] [112] This colour is reflected in the Chinese word for glaucoma, 青光眼 (qīngguāngyǎn), literally “cyan-light eye”.
Because eye movements and other bilateral stimulation techniques do not uniquely contribute to EMDR treatment efficacy, EMDR has been characterized as a purple hat therapy, i.e., its effectiveness is due to the same therapeutic methods found in other evidence-based psychotherapies for PTSD, namely exposure therapy and CBT techniques, without ...
Parinaud's syndrome is a cluster of abnormalities of eye movement and pupil dysfunction, characterized by: Paralysis of upwards gaze: Downward gaze is usually preserved. This vertical palsy is supranuclear, so doll's head maneuver should elevate the eyes, but eventually all upward gaze mechanisms fail. In the extreme form, conjugate down gaze ...
Parasympathetic fibers travel with cranial nerve III, the oculomotor nerve, to innervate the circular layer of muscle of the eye (sphincter pupillae). Damage to this nerve typically manifests itself as mydriasis, because the sympathetic supply to the pupil, which causes mydriasis, remains unaffected, and therefore unopposed.
The experience of eye strain when reading in dim light has given rise to the common misconception that such an activity causes permanent eye damage. [3] When concentrating on a visually intense task, such as continuously focusing on a book or computer monitor, the ciliary muscles and the extraocular muscles are strained. This causes discomfort ...