12/24/2025
Orthokeratology (often called Ortho-K) uses specialty rigid gas-permeable contact lenses that are worn while you sleep.
The lenses gently reshape the cornea overnight, so when you remove them in the morning, your vision can be clearer during the day without needing glasses or daytime contact lenses. Medical sources describe the effect as temporary, meaning you usually need to keep wearing the lenses on a prescribed schedule to maintain the results.
They also note that how long the clearer vision lasts can vary—some people may have good vision for most or all of the day, while others may notice vision isn’t as sharp later in the day.