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Visual acuity print that page

Visual acuity is a measure of the spatial resolution of the visual processing system and is usually tested in a manner to optimise and standardise the conditions. To this end, black symbols on a white background are used (for maximum contrast ) and a sufficient distance allowed to approximate | 2011/7/27 0:49:44

Color blindness print that page


The symptoms of color blindness also can be produced by physical or chemical damage to the eye , optic nerve , or the brain generally. These are not true color blindness, however, but they represent conditions of limited actual blindness. Similarly, a person with achromatopsia , although

Corneal transplantation print that page


Indications for corneal transplantation include the following: Optical: To improve visual acuity by replacing the opaque or distorted host tissue by clear healthy donor tissue. The most common indication in this category is pseudophakic bullous keratopathy , followed by keratoconus , corneal

Macular degeneration print that page


Institute and others to slow the progression of dry macular degeneration and, in some patients, improve visual acuity . [ 3 ] Beta-carotene was not protective. [ 3 ] [ edit ] Wet AMD Neovascular or exudative AMD, the “wet” form of advanced AMD, causes vision loss due to abnormal

Retinoschisis print that page

while retinoschisis never itself requires treatment and leads to retinal detachment (and hence to visual loss) only occasionally. Unfortunately one still sees cases of uncomplicated retinoschisis treated by laser retinopexy or cryopexy in an attempt to stop its progression towards the macula | 2011/7/16 0:48:07

Human eye print that page


The human eye is an organ which reacts to light for several purposes. As a conscious sense organ , the eye 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 distinguish

Blindness print that page


of vision loss and define blindness. [ 1 ] Total blindness is the complete lack of form and visual light perception and is clinically recorded as NLP, an abbreviation for "no light perception." [ 1 ] Blindness is frequently used to describe severe visual impairment with residual vision

Visual memory print that page


parietal cortex . However, this two streams hypothesis although useful is a simplification of the visual system as the two streams maintain intercommunications along their entire rostral course. [ edit ] Posterior parietal cortex Posterior parietal cortex (light green) is shown at

Amblyopia print that page


Amblyopia means that visual stimulation either fails to transmit or is poorly transmitted through the optic nerve to the brain for a continuous period of time. It can also occur when the brain "turns off" the visual processing of one eye, to prevent double-vision, for example in strabismus

Eyeglass prescription print that page


Spherical equivalent refraction (SER) 9 Distant vision and near vision 10 Optical axis and visual axis 11 Variations in prescription writing 12 See also 13 References 14 External links [ edit ] Abbreviations and terms Similar to medical prescriptions , eyeglass prescriptions