Colour Blindness😊

Primary Colors:

• Red (Prota), Green (Deutra), Blue (Trita).

• Mnemonic: 6 GB

Colour Defect	Name
Red	Protanopia
Green	Deuteranopia
Blue	Tritanopia

Etiology:

• Acquired:
• Blue-yellow:
• Associated with
• Retinal diseases (CSR, macular edema)
• Primary Open Angle Glaucoma (POAG)
• By → Po Retina
• Red-green:
• Associated with optic nerve lesions (optic neuritis, LHON).
• ON RGb
• Congenital:
• X-linked recessive disorders.
• Affects males > females (Carriers)
• Most common (m/c): Red green defect
• Blue:
• Associated with old age/Digoxin
• Yellow Tinging → Xanthopsia → Yellow vision
• Old age → Blue gone & Die (Diogxin)

Types: AD

• A cro
• A = Mono (Rod, Cone)
• Rod Monochromat → Hemeralopia (day blindness)

• D cro
• D = 2/3 = Anopia/anomaly
• Di → Anopia
• Trichromatic → Anomaly

Dyschromatopsia (Defective Perception):

• Dichromatic:
• Perception of 2 colors;
• blindness for 1 color (anopia).
• Conditions: Protanopia, Deuteranopia, Tritanopia.

• Trichromatic Anomalous:
• Perception of all 3 colors
• but defective perception (anomaly)
• Conditions: Protanomaly, Deuteranomaly, Tritanomaly.

Achromatopsia (Absent Perception):

• Rod Monochromat:
• Only rod function present;
• Total color blind (black & white vision)
• A/w Hemaralopia (day blindness)

• Cone Monochromat:
• One type of cone function present
• 1 cone perception

Cones

• Types of cones:

Cone Type	Wavelength Detection	Colour
L cone	Long	Red
M cone	Medium	Green
S cone	Small	Blue

• Colorful (cons) dress (Large, medium, small)