Orthok is a term derived from the combination of two words, "ortho" and "K". Ortho, in this context, refers to "orthokeratology," which is a specialized branch of optometry. Orthokeratology, also known as "ortho-K," is a non-surgical method of vision correction that involves wearing specially designed rigid gas permeable contact lenses overnight. These lenses gently reshape the curvature of the cornea, reducing or eliminating refractive errors such as myopia (nearsightedness), hyperopia (farsightedness), and astigmatism.
The letter "K" in Orthok represents keratology, which pertains to the study of the cornea. Hence, Orthok can also be understood as an abbreviated term for "corneal reshaping" or "corneal refractive therapy."
The use of Orthok lenses overnight results in temporary optical changes, allowing individuals to enjoy clear vision throughout the day without wearing corrective lenses. The effects of Orthok lenses typically last up to a few days, and thus, the lenses need to be worn regularly to maintain the desired refractive changes.
Orthokeratology is particularly popular among individuals who engage in sports or other activities where wearing traditional glasses or contact lenses can be cumbersome or pose a safety risk. Additionally, it is often recommended for children and teenagers as a potential approach to controlling the progression of myopia.
Orthok is a term widely recognized within the optometry profession and serves as a concise representation for the branch of orthokeratology and corneal reshaping.
