Colour Vision

 Colour Vision refers to the ability of the eye to distinguish different wavelengths of light and perceive them as various colours. This function is mainly controlled by specialized cells in the retina called cone cells.


🔹 Key Points About Colour Vision:


1. Cone Cells:

There are three types:

🔴 Red-sensitive cones

🟢 Green-sensitive cones

🔵 Blue-sensitive cones


These respond to different wavelengths of light.


2. How It Works:


  • Light enters the eye and strikes the retina.

  • Cone cells are stimulated based on the light’s wavelength.

  • The brain interprets the combined input from the three cone types to produce the perception of colour.


3. Normal Colour Vision:

  • Known as trichromatic vision.

  • All three cone types function properly.


4. Colour Vision Deficiency (CVD):

  • Also called colour blindness.

  • Caused by missing or malfunctioning cones.

  • Most common type is red-green colour blindness.

  • It is often inherited and more common in males.


5. Testing Colour Vision:

Ishihara plates: Common test for detecting red-green colour deficiency.


Anomaloscope or Farnsworth D-15 test: For more detailed diagnosis.


6. Importance of Colour Vision:

Crucial in daily tasks

 (driving, cooking, reading signs).


Important for certain professions

 (pilots, electricians, graphic designers)


For further process click https://medorbis.ai


Comments

Post a Comment

Popular posts from this blog

MYOPIA

What is Myopia? Myopia (commonly called nearsightedness) is a vision condition where a person can see nearby objects clearly but distant objects appear blurry. What Causes Myopia? It usually occurs when: The eyeball is too long from front to back. The cornea (the clear front surface of the eye) is too curved. As a result, light rays focus in front of the retina, instead of directly on it. Symptoms of Myopia: Blurred vision when looking at distant objects. Squinting to see clearly. Eye strain or headaches (especially after focusing on distant objects). Difficulty seeing while driving, especially at night (night myopia). Risk Factors: Genetics : If one or both parents are myopic, the risk increases. Excessive near work : Prolonged reading, computer, or phone use. Lack of outdoor time: Spending less time in natural light, especially in childhood. Treatment and Management Corrective Lenses: Eyeglasses or contact lenses with minus (–) power lenses. Refractive Surgery: LASIK, PRK, SMILE – re...
Read more

Important of colour check

  Why is it important to check colour vision? Checking colour vision is important for several reasons: 1. Early Detection of Vision Disorders It helps detect congenital colour blindness, especially in children. Can also reveal acquired conditions due to eye diseases (e.g., glaucoma, optic neuritis). 2. Career Requirement Certain professions require normal colour vision, such as: Pilots Electricians Military personnel Police officers Graphic designers Drivers Railway and maritime workers 3. Safety and Daily Functioning Correct colour recognition is vital for identifying traffic lights, warning signs, and colour-coded materials. Difficulty distinguishing colours can impact school performance, cooking, clothing choices, and reading charts or graphs. 4. Monitoring Disease Progression Colour vision testing helps track changes in patients with: Diabetic retinopathy Multiple sclerosis Macular degeneration Medication side effects (e.g., ethambutol) 5. Educational Guidance In children, dete...
Read more