Feeds

Why do I get eye strain?

Shedding light on tired eyes

  • alert
  • submit to reddit

Build a business case: developing custom apps

Maybe grandma wasn't right. Experts now contend that reading in the dark probably has no long-term damaging effects on the eyes. But eyes become more tired in poor light since they have to work harder to discriminate letters, colors, and objects. So it’s a good idea to work and play in plenty of light, especially as one gets older.

It's a sad fact with eyes that as one gets older, pupils get smaller. When you're older and wish to read with ease, it may take more light to illuminate the retina to the same level that it took to read with ease as a youth.

Opinion is divided as to whether or not regular eye exercises can strengthen the muscles in the eyes responsible for focusing. Eye exercises, also known as vision therapy, should only be undertaken on the advice and monitoring of an ophthalmologist or optometrist. Such vision therapy is usually intended for younger patients who have undeveloped or underdeveloped visual problems that may or may not involve specific eye muscles.

Some problems are perceptual in nature. The problem in middle age, when focusing on close objects becomes a strain, affects everybody at different times depending a host of factors. Some major factors include:
1. Refractive status of eyes (for example, nearsightedness (myopia) and other conditions),
2. Daily visual demands,
3. General health status and medications taken, and so on. The muscles responsible for focusing do not really change.

It is the transparent lens that actually gets less malleable with age. The chemical properties of the lens of the eye change and harden the lens that prohibits the lens from bending and changing thickness as easily. Human evolution is probably to blame for this as our prehistoric ancestors probably did not depend on eyes for close work nearly as much as we do.

Stephen Juan, Ph.D. is an anthropologist at the University of Sydney. Email your Odd Body questions to s.juan@edfac.usyd.edu.au

Next gen security for virtualised datacentres

More from The Register

next story
Boffins attempt to prove the UNIVERSE IS JUST A HOLOGRAM
Is this the real life? Is this just fantasy?
China building SUPERSONIC SUBMARINE that travels in a BUBBLE
Shanghai to San Fran in two hours would be a trick, though
Our LOHAN spaceplane ballocket Kickstarter climbs through £8000
Through 25 per cent but more is needed: Get your UNIQUE rewards!
SpaceX prototype rocket EXPLODES over Texas. 'Tricky' biz, says Elon Musk
No injuries or near injuries. Flight stayed in designated area
Galileo, Galileo! Galileo, Galileo! Galileo fit to go. Magnifico
I'm just a poor boy, nobody loves me. But at least I can find my way with ESA GPS by 2017
Astronomers scramble for obs on new comet
Amateur gets fifth confirmed discovery
prev story

Whitepapers

A new approach to endpoint data protection
What is the best way to ensure comprehensive visibility, management, and control of information on both company-owned and employee-owned devices?
Implementing global e-invoicing with guaranteed legal certainty
Explaining the role local tax compliance plays in successful supply chain management and e-business and how leading global brands are addressing this.
Maximize storage efficiency across the enterprise
The HP StoreOnce backup solution offers highly flexible, centrally managed, and highly efficient data protection for any enterprise.
How modern custom applications can spur business growth
Learn how to create, deploy and manage custom applications without consuming or expanding the need for scarce, expensive IT resources.
Next gen security for virtualised datacentres
Legacy security solutions are inefficient due to the architectural differences between physical and virtual environments.