Refraction measures how light bends through the cornea and lens to focus precisely on the retina. It helps to identify refractive errors—such as myopia (nearsightedness), hyperopia (farsightedness), astigmatism, or presbyopia—that cause blurred or distorted vision. Knowing your exact prescription ensures you achieve optimal clarity and comfort.
What to expect during the test
You will be seated and look through a device called a phoropter while reading letters on a chart at various distances. The specialist switches different lenses and asks which ones make vision clearer. The test is painless and usually completes in just a few minutes. If you wear contacts, you may be asked to remove them beforehand.
Clinical benefits
- Provides precise vision correction for everyday tasks like reading, driving, or screen work
- Helps reduce eye strain, headaches, and fatigue caused by incorrect vision
- Enables early detection of changes in vision or underlying eye issues
- Forms the basis for planning surgery or advanced treatments, if needed
