Question

Color blindness is due to defect in ________?

• A. Cones
• B. Rods
• C. Rods and Cons
• D. Rhodospin

Answer 1

Answer:

A. Cones

• Color blindness is often caused by defects in the cone cells in the retina.
• Cones are photoreceptor cells in the retina that are responsible for color vision, functioning best in relatively bright light.
• There are three types of cone cells, each sensitive to either red, green, or blue light.
• If any type of these cones is absent or functioning improperly, it can lead to different forms of color blindness. For example, the most common types of color blindness are red-green color blindness, which occurs when the red or green cones are deficient or absent.
• The condition can be inherited or acquired due to various factors, including eye diseases, aging, or damage to the eye or brain.
• Red-green color blindness is more common in males due to its linkage to the X chromosome; males have only one X chromosome, so a single defective gene can cause the condition.
• Diagnosis of color blindness is typically done using color vision tests like the Ishihara test, which consists of plates with colored dots forming numbers or patterns.
• While there is no cure for inherited color blindness, specific tools such as color-corrective lenses or digital apps can help individuals manage the condition in daily tasks.