Why do some peoples eyes look blue?

People with blue eyes have a completely colourless stroma with no pigment at all, and it also contains no excess collagen deposits. This means that all the light that enters it is scattered back into the atmosphere and as a result of the Tyndall effect, creates a blue hue.

Why are blue eyes colorless?

When there’s a lack of melanin, the stroma reflects light. Since blue is the easiest color to scatter, eyes with the least amount of melanin appear bluer. This means blue eyes are technically colorless. The amount of light that hits the stroma determines the hue of the iris.

Why do blue eyes have a colour?

This means that all the light that enters it is scattered back into the atmosphere and as a result of the Tyndall effect, creates a blue hue. Interestingly, this means that blue eyes don’t actually have a set colour – it all depends on the amount of light available when you look at them.

What causes blue tint in the eye?

The blue tint is caused by thin or transparent scleral collagen found within the eye. In osteogenesis imperfecta, the body fails to produce type I collagen, a component that helps form bone, connective tissues, teeth and the white part of the eye or sclera, says the American Academy of Orthopaedic Surgeons.

What is melanin and how does it affect eye colour?

Melanin is a brown pigment that controls the colour of our skin, eyes and hair. The colour of our eyes depends on how much melanin is present in the iris. There’s only brown pigment in the eye — there is no hazel pigment or green pigment or blue pigment. Brown eyes have the highest amount of melanin in the iris, and blue eyes have the least.

Why are some pigments blue in colour?

This means that while some of the light entering them is absorbed by the pigment, the particles in the stroma also scatter light as a result of something called the Tyndall effect, which creates a blue hue (it’s similar to Rayleigh scattering which makes the sky look blue ).

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