How are the eye doctors test for color blindness?

Color charts. Most eye doctors own an ishihara color vision test booklet which can be used to determine if you are color deficient. There are other booklets as well, color caps, and other more sophisticated means to determine the degree and type of color deficiency you might have.
Yes. Doctors can tell if a person is color blind by using the ishihara test. This test consists of 38 circles of colored dots. Each of the circles of dots contains a hidden number made up of certain colors of dots. Depending on whether or not a person can read the number in the circles, his type of color blindness can be diagnosed. Parts of the ishihara test are posted on websites for people to use.
Yes. They use a booklet or chart with pictures made up of dots of various colors. People who are color blind for certain colors will not be able to see the image in the picture.

Related Questions

Which type of tests would an eye doctor do to tell if someone is color blind?

Color vision tests. The most common is the ishihara color vision test, where there are a series of pages which have numbers created with dots of different colors. Those with good color vision seen one number, and those with color blindness see a different number. Read more...

If a bullet grazed your face close to the eye, could it make you color blind?

No. Color deficiency comes from inherited defects in the photoreceptors, or massive retinal loss from retinal illness (like advanced diabetes) , optic nerve disease or rare strokes in the cerebral cortex affecting color. The bullet passage you described cannot be a cause. Read more...

If the eye doc. Finds a tear in the retina on time can he prevent blindness or is it to late?

Most of the time. A retinal tear, if found early (while the retina is still attached), can be lasered to stabilize it. The laser acts like a staple gun to prevent further detachment. If the retina has already started detaching, an office procedure involving a gas injection/laser is done. If a lot of the retina is detached, major or surgery is needed. If it's been detached for long enough, blindness may result. Read more...
Depends. The retina is a layer of tissue covering the back of the eye and it translates light into an electrical signal that is then relayed via the optic nerve to the brain. The typical problem with the retina is detachment not a tear. Think of it as wallpaper bubbling off the wall. A retina specialist can do a combo procedure called vitrectomy with scleral buckle. This procedure can save sight. Read more...
Retinal tear. Retinal tears can almost always be successfully treated with either laser or cryopexy (freezing) treatment. This will usually prevent progression to retinal detachment which usually requires more invasive surgical treatment. Read more...

Hi doctors, was just wondering what is coreal- transplant can it restore the eye sight of a person who is partially blind?

Sometimes. Corneal transplantation is the surgery in which a diseased cornea (the window at the front of the eye) is removed and replaced with a donor cornea. In eyes otherwise normal, with the cornea being the only block to good vision, the procedure can be remarkably vision improving. If the eye sees poorly from something else, than this will not work. Read more...