By using specially crafted contact lenses, the Orthokeratology (Ortho-k) procedure temporarily alters the cornea's structure to lessen myopia (nearsightedness). Given that there is no surgery involved, the risk is lower than with refractive surgery. To correct or manage myopia, ortho-k lenses are also known as corneal reshaping contact lenses or nighttime contact lenses. Nearsightedness, astigmatism, and hyperopia are the most common refractive problems that these lenses are prescribed to treat. Ortho-k is occasionally used to treat presbyopia as well as to halt the progression of childhood myopia. A 2015 study by the American Academy of Optometry found that wearing Orthokeratology lenses consistently slowed the progression of myopia by about 45% over the course of two years and by 30% over the course of five years, measured in terms of axial length. Myopia and high myopia are becoming more and more commonplace on a global scale. Myopia is a significant public health issue, and excessive myopia is the second-leading factor in visual impairment globally. In East Asia, the prevalence of myopia was around 90% among students and affected close to 50% of the urban population, according to a 2016 research from the National Center for Biotechnology Information (NCBI). Additionally, because myopia's visual difficulties begin earlier than other causes of blindness like cataract, its effects on quality of life are also seen earlier. The cost of eye illnesses in the United States is estimated to be over US$ 139 billion, with close to US$ 16 billion going toward myopia correction alone, according to a 2018 study published in the Eye Contact Lens journal. Myopia prevention and control techniques are therefore highly sought after on a global scale. Additionally, prolonged use of laptops, smartphones, and tablets results in digital eye strain, which damages children's and young people's eyes permanently. The best candidates for orthokeratology are young people whose nearsightedness is steadily getting worse. Orthokeratology is the use of gas-permeable contact lenses to temporarily reshape the cornea to lessen refractive errors like myopia, hyperopia, and astigmatism. It is also known as night lenses, Ortho-K, OK, Overnight Vision Correction, Corneal Refractive Therapy (CRT), Cornea Corrective Contacts, Eccentricity Zero Molding, and Gentle Vision Shaping System (GVSS). As early as the 1940s, physicians learned about the reshaping phenomenon of glass lenses. The use of contact lenses to reduce myopia is covered in this history of orthokeratology by a number of authors. In the 1960s, George Jessen developed what was likely the first orthokeratology design using PMMA, which he marketed as "Orthofocus." Due to the typically unpredictable outcomes of these early designs, it was thought that applied Orthokeratology was more of an art or a matter of chance than a science. Many organisations and people assert that they were the first to create contemporary orthokeratology treatments. However, the first reverse zone lens design was created in the 1980s by Dr. Richard Wlodyga, Dr. Philip B. Hanisch, and Nick Stoyan, in particular. The cornea adapts to some extent between hours to days, although complete adaptation frequently takes two to three weeks. Some people may experience eyesight problems during this initial phase. After adaptation, FDA testing revealed that more than 65% of patients had 20/20 vision and more than 90% had 20/40 vision or greater (the typical US requirement for driving without glasses). Although steady, the remedial impact is not long-lasting. If left unattended, the eye will gradually regain its original shape over the course of three days. In order to preserve and maintain the corrected corneal shape, Ortho-K lenses must be worn frequently. The cornea adapts to some extent between hours to days, although complete adaptation frequently takes two to three weeks. Some people may experience eyesight problems during this initial phase. After adaptation, FDA testing revealed that more than 65% of patients had 20/20 vision and more than 90% had 20/40 vision or greater (the typical US requirement for driving without glasses). Although steady, the remedial impact is not long-lasting. If left unattended, the eye will gradually regain its original shape over the course of three days. In order to preserve and maintain the corrected corneal shape, Ortho-K lenses must be worn often.
0 Comments
Leave a Reply. |
Categories
All
|