How do Red and near infrared lights affect the eyes?

A very interesting email arrived today, querying the effect of red LED lights on eyes.

It is all about the wavelength, not the type of light.

Red and near infrared wavelengths are not harmful to the eyes.

In fact, red wavelengths (especially 670nm, a deep red colour) are showing promise as a treatment for Age-related Macular Degeneration, a devastating progressive eye condition.

The lead researcher is Prof Glen Jeffery, professor of neuroscience at University College London.

Here’s a list of Prof Jeffrey’s publications.

And here’s a link to one of his articles.

If you are planning to make your own light hat device, make sure that you purchase red LEDs. There are LED strips available with lots of colours – avoid these as a rainbow isn’t helpful.

You just want red or near infrared wavelengths.

Author: RedlightsontheBrain

Redlightsonthebrain is written by Catherine, a retired doctor on behalf of Light Ahead Inc, a Tasmanian-based not-for-profit organisation. Light Ahead Inc aims to help people to learn about neurogenerative diseases and the practical, safe and scientifically-based things that may be able to help. Part of this is to provide low-cost access to red light devices, hence the DIY instructions on this blog.