Diagnostics·Diagnostics
Refraction eye test
Informed by recognized medical guidance
Overview
A refraction eye test is a simple, painless examination that measures how your eyes bend (refract) light. It helps your eye doctor find the right prescription for glasses or contact lenses. During the test, you look through a device called a phoropter while the doctor changes lenses and asks which one makes letters on a chart clearer.
Key facts
- Refraction tests detect refractive errors like nearsightedness, farsightedness, astigmatism, and presbyopia.
- The test is non-invasive and takes about 10–20 minutes.
- Dilated refraction (using eye drops to widen pupils) allows a more thorough check for children or certain conditions.
Yes, refraction eye tests are very common. Most people have one as part of a routine eye exam at least every two years.
People of all ages, from young children to older adults, may need a refraction test if they have vision changes or as part of regular eye health checks.