Things You Need To Know About Partial Color Blind Tests

Partial color blindness test is a medical examination procedure to determine whether the eye is able to see or distinguish colors properly. This examination is often carried out to obtain a certificate of color blindness required as a condition of applying for a job or continuing studies. Color blindness is a vision disorder characterized by the inability to see or distinguish certain colors. In total color blindness, the eye is unable to see colors at all and only gray. While partial or partial color blindness is a condition when the eye cannot see certain colors well, for example, cannot distinguish red from green.

Types of partial color blindness

Partial color blindness is divided into two types and each has a different symptom. The following is the explanation:

Red-green color blindness

Red-green color blindness is the type of color blindness that is most often experienced by people with color blindness. There are several types of red-green color blindness, namely:

• Protanopia

Protanopia is a type of partial color blindness that occurs when someone sees red looks like black. People with this type of color blindness might also see orange green to yellow.

• Protanomaly

Patients with protanomalies will see orange, yellow and red, becoming green. The green color is also not as bright as the original color.

• Deuteranomaly

Someone said to suffer from deuteranomaly if you see green and yellow colors look like red. Sufferers are also difficult to distinguish between purple and blue.

• Deuteranopia

Deuteranopia is a condition when the eye sees green to beige and red to tawny.

Blue-yellow color blindness

Blue-yellow color blindness is a rarer type of color blindness compared to red-green. There are 2 types of blue-yellow color blindness, namely:

• Tritanomaly

This type of partial color blindness makes one see the color blue becomes greener. This condition also often makes it difficult for sufferers to distinguish pink from red or yellow.

• Tritanopia

Tritanopia is a condition when the eye sees blue as green and yellow as light gray or purplish.

This Is Done When Partial Color Blind Test

There are several methods of examination that can be done as a partial color blind test, namely:

Ishihara Test

This examination is one of the most common types of partial color blindness tests. This examination is practical and does not require complicated medical equipment. In this test, patients will be invited to sit indoors with adequate lighting. The doctor will place a card called the Ishihara card in front of the patient. The picture on this card is composed of colored dots that form a pattern in the form of numbers, letters, symbols, or grooves. Next, the doctor will ask the patient to close one eye and read the letters or numbers that are on the card. In addition to reading numbers or letters, patients are also asked to trace the flow of certain colors on the card with a finger. After one eye is finished, the same test will be carried out on the other eye.

Anomaloscope

When undergoing this test the patient will be asked to look into an instrument similar to a microscope. This tool is called an anomaloscope. When looking into the device, the patient will see two circles divided into two colors, namely red-green on one side and yellow on the other side. After that, the patient will be asked to adjust the color by turning a switch on the device until the colors on the two circles appear to be the same color.

Colored wool yarn test

This partial color blindness test method is also called the Holmgren test. This inspection uses colorful wool yarns that have been specially designed. In this examination, the doctor will ask the patient to take a thread of a certain color. If the patient can take wool yarn according to the instructed color, then the patient is judged not to have color blindness. However, the results of this examination have a lower level of accuracy than other partial color blind tests. To determine whether you suffer from color blindness or not, you can consult an eye specialist to undergo a color blindness test. After undergoing the examination, the doctor will determine whether you can see the color normally or not.