Determining your prescription
During this part of the test, your Eye Care Professional will find out how much correction each eye needs. To do that, they’ll most commonly use a phoropter. You’ll be asked: “Which is better? Number one or number two,” because they’re cycling through different lens powers and seeing which one provides the sharpest vision. Your Eye Care Professional may also opt to use other tools like a retinoscope. A retinoscope shines a light into your eye, and depending on how the light reflects off the retina, the doctor can determine your prescription.
Are your eyes working as a team?
Another part of the appointment will test for abnormalities in the way your eyes function and/or move together. This is called binocular vision because your brain must take information from both your eyes to create one image. Because of that, it’s not just a test of your eye’s muscular function but also your neurological function. Your Eye Care Professional may test this by moving an object around in different directions and asking you to follow with your eyes.
Inspecting the outside of your eyes
In this part of the test, your Eye Care Professional will look at the external parts of your eyes like your eyelashes, cornea (the front surface of your eyes) and iris (the coloured part of your eye) with a special microscope called a slit lamp.
Will they dilate your pupils?
Your Eye Care Professional may want to dilate your pupil. This procedure allows them to better see through to the back of the eye and evaluate the health of your retina and optic nerve.