Doctor insights on:
Color Blindess Test
Color plates: The ishihara test plates are a series of dots of various colors with an embedded number or symbol which cannot be easily seen by the color deficient due to color confusion. They are the most commonly available test in ophthalmologists office although others are also available and some are better at separating the forms of color deficiency out. Ishihara is a good screening test. ...Read more
Vision impairment and blindness are conditions in which a person cannot see well or see at all, even with glasses or contact lenses. If a person's best vision (with correction) out of either eye is only 20/70 - 20/200, he is impaired. If he can see no better than 20/200 or his visual field is no more than 20 degrees (severe "tunnel" vision), ...Read more
Loss of color vision: In the retina of your eye, there are rods (for seeing in the dark) and cones (for seeing color and fine detail). There are three types of cones, similar to the three primary colors, and the color blindness test checks subtle differences between shades to see if you are missing cones of one of the color types (usually red or green). But usually you are not aware of any problem seeing things. ...Read more
Color perception: Color vision can be altered in the usual way by inherited defects in the color perceptive elements of the retina. But advanced retinal disease like diabetes can impair color recognition; and changes in the color of the lens, and a few odd types of strokes and optic nerve disease all can alter color recognition patterns. Your ophthalmologist can sort this out for you. ...Read moreSee 1 more doctor answer
Color confusion: The tests are designed usually with dots of color along the axis which a color deficient person might confuse them. So by lacking the ability to pick out certain colors, the number or figure will not stand out from the background of dots and so will not be recognized. Some tests are sophisticated enough to indicate which type of color blindness is present. ...Read more
Is it possible to get accurate visual field test with macular pucker decline in visual acuity, lights less bright & white computer screen looking gray?
Usually it is fine: You have defects in the central visual portion of your field of view - an area poorly outlined by most field testing devices. Field tests will define major defects which largely will register from the peripheral areas tested. Have you had a field tested in the past? Is there some condition being sought for with a field.? Your ophthalmologist would not order a field if he doubts the result. ...Read more
Visual field test result normal - 3/14 fixation error. Some peripheral vision loss not in field of vision. Why does test result say normal?
I don't know: specifics about the EPT test but the evaporation lines that I have seen were gray. ...Read more
NOOOOOOOOOOOOOOOOOO: Not at all. Watery- xs fluids Yellow- concentrated. ...Read more
The darkness of : Skin around the eyes that comes from bruising is eventually absorbed back into the body. ...Read more
Depends: there are multiple chips that are green depending on what is in the urine. If there is blood in the urine it will turn the yellow chip anywhere from light green to dark green depending on the amount of blood present. The pH chip will also turn green with a higher pH. If protein is present in the urine, the chip will turn a shade of green ...Read more
Somewhat: The colors in color deficiencies lose their distinctive character (technically become desaturated) so that distinctions are blurred and many greens and reds in the most common form become poorly distinct. The actual color is not know as this is a psychological phenomenon and the color deficient identify many colors the same that a 'normal' would call distinct. ...Read more
Does intensity of color of a urin gonorrhea test correlate automaticaly with time that one was infected? Light color=recent, intense color=long time?
Unreliable test: These tests are not reliable. Whether weakly or strongly positive, speak with your doctor or clinic about more accurate testing, especailly a nucleic acid amplification test (NAAT). If you do have gonorrhea, for sure the color intensity of the test says nothing at all about how long the infection has been present. Onset of symptoms or when you had a high risk exposure are the only ways to know. ...Read more
OPK test & ferning positive yesterday. OPK test positive, but no ferning today. What does this mean? What is estimated time of ovulation?
The same: Color blindness was the original term for conditions in which color recognition was impaired. Since "blindness" is a very charged termed, deficiency has been substituted as the politically correct term since most people with defects in color recognition are not blind at all. ...Read moreSee 1 more doctor answer
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