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[10] The onset of blepharospasm tends to be during the ages 40–60. [8] [10] [11] The condition is roughly more than twice as frequent among females than males, [7] [8] [11] which may be related to menopause and hormone treatments. [12] [13] In Taiwan, the condition is more frequent among white- than blue-collar workers. [8]
The flicker of a CRT monitor can cause various symptoms in those sensitive to it such as eye strain, headaches [9] in migraine sufferers, and seizures in epileptics. [10]As the flicker is most clearly seen at the edge of our vision there is no obvious risk in using a CRT, but prolonged use can cause a sort of retinal shock where the flickering is seen even when looking away from the monitor.
Computer vision syndrome. 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.
Corneal reflex. Purpose. Examination of corneal reflex is part of some neurological tests. The corneal reflex, also known as the blink reflex or eyelid reflex, [ 1] is an involuntary blinking of the eyelids elicited by stimulation of the cornea (such as by touching or by a foreign body), though it could result from any peripheral stimulus.
The flicker fusion threshold, also known as critical flicker frequency or flicker fusion rate, is the frequency at which a flickering light appears steady to the average human observer. It is a concept studied in vision science, more specifically in the psychophysics of visual perception. A traditional term for "flicker fusion" is "persistence ...
Blinking. Blinking is a bodily function; it is a semi-autonomic rapid closing of the eyelid. [ 1] A single blink is determined by the forceful closing of the eyelid or inactivation of the levator palpebrae superioris and the activation of the palpebral portion of the orbicularis oculi, not the full open and close. [citation needed]
Users of two types of eye drops are being warned to stop using them because the FDA said they may contain bacterial and fungal contamination. FDA issues alert on 2 eye drops that tested positive ...
Red reflex. The red reflex (also called the fundal reflex) refers to the reddish-orange reflection of light from the back of the eye, or fundus, observed when using an ophthalmoscope or retinoscope. It is important to note that the red reflex may be absent or poorly visible in people with dark eyes, and may even appear yellow in Asians or green ...