|Baby's Eye ~The thin tear film over a baby’s clear eye reflects the world and adds a layer of interference colours. The pupil is dark, imponderable, absorbing all the world and learning. The blue iris, mysterious.
Sylvia Wenmackers (blog) pictured her son when he was just over two months old.
©Sylvia Wenmackers, shown with permission
The iris sits in the eye’s front chamber between the world facing cornea and the brain facing lens. A wonderfully flexible and responsive curtain. Effortlessly opening and closing, regulating the intensity of light to the retina.
Nearly all baby irises are blue and we wait to see what adult colours will come.
It is the colour of the sky and for good reason.
The outer surfaces of the cornea and the thin tear film wetting it reflect the distant building and sky.
Interference colours are superimposed. They arise in the same way as the colours of soap bubbles or oil films.
The in-phase and out of phase conditions depend on film thickness, the wavelength (colour) and the viewing angle.
The result is iridescent colours changing and shifting from moment to moment.