Is your bad eyesight a sign that you need eye glasses, or just a break from the computer screen? By Deborah Lin
Do you need spectacles to correct your low vision? (Photo: LeeChangmin / www.pixabay.com)
If you have poor distance vision, eye strain or eye fatigue, and frequent squinting, you might have MYOPIA
This happens when the eyeball is too long or the cornea has too much curvature, such that light rays of images focus in front of the retina (instead of directly on the retina). Also known as nearsightedness, the condition makes seeing distant objects difficult. Myopia usually occurs between ages six and 12, and stabilises by age 16 for women at around -3.00 dioptres or 300 degrees.
If you have difficulty seeing objects close up and further away, eye strain or eye fatigue, and frequent squinting, you might have ASTIGMATISM
Due to the cornea curving more steeply in one direction, people with astigmatism encounter blurred vision and have difficulty noticing fine details (whether close up or at a distance).
Astigmatism levels typically stabilise at the age of 25 and usually occurs with myopia or hyperopia. Anything above 200 to 250 degrees is considered a high level of astigmatism, says Dr Eugene Tay, a consultant ophthalmologist at the The Lasik Surgery Clinic (LSC).
Next: Hyperopia and Presbyopia