Orthokeratology, or ortho-k, is the use of specially designed and fitted contact lenses to temporarily reshape the cornea to improve vision. Most ortho-k lenses are worn at night to reshape the front surface of the eye while you sleep. Vision improvements are reversible but can be maintained if you keep wearing the lenses as directed.
GP Lenses for Myopia Control and Ortho-K
Research shows that gas permeable lenses might be effective in slowing the progression or worsening of myopia or nearsightedness, particularly in children. They are also used in Orthokeratology (ortho-k), a vision correcting procedure in which you wear the lenses at night to reshape your cornea for improved vision during the day.
Articles : Orthokeratology and Myopia Control
Now considered a major health concern, myopia (nearsightedness) has increased by 66% in the United States since 1971. Onset can begin as early as age 6, and early detection is the key to prevention and reduction of potentially serious complications later in life.
Corneal Refractive Therapy lenses have been shown to help reduce the amount of myopia that a child develops. This is called myopia control.
Some interesting VDO about Orthokeratology
Kaitlyn Ma , A youtuber using Ortho-K lens. She answer some questions about Ortho-K lens from her real experience.