What Is the Ideal Reading Light?

Many people mistakenly believe dim light damages the eyes.

Undoubtedly, John Donne penned his tortured poems by the light of a candle, and later John Steinbeck wrote by the light of an incandescent bulb. In the 21st century, most authors write by the light of a computer screen with fingers tapping furiously on plastic keys. The light source of each period yielded literary masterpieces to be enjoyed by readers in the lighting of their choice.

Myths

There is a common misconception that reading in dim light can damage your eyes. Eyes, in fact, are hardier than that. The absence of light isn't likely to do any permanent damage, nor is reading in too much light. Rather, insufficient or excessive light can cause eyestrain, a problem the Mayo Clinic describes as temporary. Eyestrain manifests itself by way of several symptoms including aching eyes, dry eyes, itching eyes, watering eyes, headaches and/or a sore neck.

General

In general, the ideal light for reading is determined by your eyes and not by an ophthalmologist. Instead of providing a particular wattage of lightbulb or suggesting a particular variety of light, the University of Michigan Kellogg Eye Center recommends that the light should simply provide good illumination without creating any glare.

Paper

Reading printed books is easier on eye muscles than reading a computer screen. The paper is less reflective, which decreases glare, which in turn decreases strain. Nonetheless, eyestrain can result from reading printed material and can be avoided by directing light so that it shines over the shoulder and illuminates the text rather than coming from the side where the light will shine on the eyes as well.

Screen

Although the computer screen can be particularly strenuous on eyes, adjusting the contrast of the screen and maximizing the distance from which you can comfortably read may remedy the problem. Eyes work harder in order to focus on close-up work than on distant work, so moving away from the screen (while increasing font size if necessary) can ease the strain. Also, avoid placing overhead lights that shine directly on the screen.

Exceptions

While eyestrain may be a result of too much light or too little light, there are cases when the underlying cause is more complicated and requires medical treatment. If adjusting the light while reading doesn't help eyestrain or if you notice a distinct change in your vision, contact a doctor.

References

• University of Michigan Kellogg Eye Center
• The Mayo Clinic
• Office Ergonomics Training