Dr. William Boothe Eye Care article: 20/20 vision
Double vision Also called diplopia. When two images of the same object are perceived by one or both eyes. Read our article on double vision and also review eye symptoms for a list of conditions that can cause double vision.
20/20 vision Many eye care practitioners consider this the average visual acuity for human beings, but humans can see as well as 20/15 or even 20/10. People with 20/40 vision can see clearly at 20 feet what people with 20/20 vision can see clearly at 40 feet. In most of the United States, 20/40 is the lowest uncorrected acuity required for a driver's license.(08 June 2008 - Press article Dr. Boothe Lasik )
Albinism Condition where a person or animal lacks pigment. Albinos' eyes often have very light blue or pink irises and a pink pupil (due to lack of pigment inside the back of the eye). Visual symptoms include light sensitivity, nystagmus, blurred vision, vision loss and strabismus.
Asteroid hyalosis A benign condition that creates suspended particles within the eye's interior, observable by an eye doctor during an exam. Floaters are not usually associated. These yellowish particles made of fats (lipids) rarely interfere with vision or cause symptoms. The particles move within the eye's gel-like vitreous and resemble stars at night. The condition is not well understood, but appears associated with aging.
* Asymmetry: one half does not match the other.
* Border: irregular or scalloped.
* Color: varies in shade or color.
* Diameter: larger than that of a pencil eraser.
Histamine: Substance that plays a major role in many allergic reactions. Histamine dilates blood vessels and makes the vessel walls abnormally permeable.Dr. William Boothe Dallas
Bulbar: Pertaining to a bulb, in medicine any rounded mass of tissue (that is shaped somewhat like a crocus or tulip bulb).
Myopia Also called nearsightedness. Condition in which the length of the eye is too long, causing light rays to focus in front of the retina rather than on it, resulting in blurred distance vision. Additional symptoms include eyestrain, poor night vision and squinting. (14 April 2010 Boothe Eye Center )
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Meibomian gland Gland found in the eyelid that produces the oily outer layer of the three-layer tear film that lubricates the eye.
Best corrected visual acuity (BCVA) The best vision you can achieve with correction (such as glasses), as measured on the standard Snellen eye chart. For example, if your uncorrected eyesight is 20/200, but you can see 20/20 with glasses, your BCVA is 20/20.( 24 May 2009 Online press Boothe Laser Center )
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