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Pinhole glasses, also known as stenopeic glasses, are eyeglasses with a series of pinhole-sized perforations filling an opaque sheet of plastic in place of each lens. Similar to the workings of a pinhole camera, each perforation allows only a very narrow beam of light to enter the eye which reduces the size of the circle of confusion on the ...
The Purkinje tree is an image of the retinal blood vessels in one's own eye, first described by Purkyně in 1823. It can be seen by shining the beam of a small bright light through the pupil from the periphery of a subject's vision. This results in an image of the light being focused on the periphery of the retina.
Eventual blindness (legally defined in the USA as 20 degrees or less in the best seeing eye or visual acuity of 20/200 or worse, and in the UK as having central visual acuity of less than 3/60 with normal fields of vision, or gross visual field restriction, or being unable to see at 3 metres (10 ft) what the normally sighted person sees at 60 ...
The symmetric design, however, was difficult to accept for patients, because the eyes in general work asymmetrically. When you look to your right, your right eye views distal (i.e. looking through the lens near to the arm of the spectacles) while your left eye views nasal (i.e. looking through the lens near to the bridge). Modern sophisticated ...
Image credits: onesmilematters #2. Letting your children do a beauty regime. 9 year olds do not need to exfoliate, use night cream and day serum, and beg their mommie to spend $50 on special face ...
In order to see a clear image, the eye must focus rays of light on to the light-sensing part of the eye - the retina, which is located in the back of the eye.This focusing - called refraction - is performed mainly by the cornea and the lens, which are located at the front of the eye, the anterior segment.
Monocular vision impairment refers to having no vision in one eye with adequate vision in the other. [ 2] Monopsia is a medical condition in humans who cannot perceive depth even though their two eyes are medically normal, healthy, and spaced apart in a normal way. Vision that perceives three-dimensional depth requires more than parallax.
Image credits: Shouty_Dibnah #3. My dad once took me into downtown LA to make me sit next to some homeless guys while berating me for getting a bad grade. He said I was gonna grow up to be just ...