Orthokeratology ortho k is one of the more challenging treatment modalities in an eye care practitioners toolbox, especially considering effective myopia control treatment needs to begin by the age of six or seven. Orthokeratology also referred to as orthok, ok, overnight vision correction, corneal refractive therapy, crt, and gentle vision shaping system, gvss refers to the use of gaspermeable contact lenses that temporarily reshape the cornea to reduce refractive errors such as myopia, hyperopia and astigmatism. Using a diagnostic fitting set, empirically ordering the lenses through consultation or designing a lens using topography software are other options when fitting ortho k lenses figure 1. Trouble shooting guide for orthok lenses the basic design of the third generation e lens for orthokeratology 1. Orthokeratology orthok is the fitting of specially designed gas permeable. In 1994, the fda granted the first ever daily wear approval for a lens indicated for orthokeratology to a type of lens called the contex ok lens. Mar 26, 2018 just to show you how simple the crt design is, they just have a chart and you just take flat k and the spherical part of the refractive error, and you determine the lens design based on that. The lens may be fitted either empirically via the internet through a direct connection between the corneal topographer and laboratory or by using a diagnostic lens fitting set to choose the appropriate lens. Ckr is a continuous aspheric reverse geometry lens design based on corneal topography measurements. Orthokeratology uses specially designed reverse geometry gas permeable gp orthok shaping lenses worn during sleep. Orthokeratology orthok corneal reshaping with gp contacts. So, for example, if their flat k is 44, and refraction is 2, 0. This method can be used as an alternative to eyeglasses, refractive surgery, or for. Orthokeratology orthok is a special rigid contact lens worn at night to achieve myopic reduction and control.
Reverse geometry orthok lens effective for postrefractive. The longitudinal orthokeratology research in children loric. Visionarys orthok system defines efficiency with an easy to fit design and an automated tool that makes designing quick and accurate. Dec 08, 2017 only standard design lens spherical 4zone lens was available during our study period limited the result applied only to children with lowtomoderate myopia and low astigmatism and who could achieve satisfactory orthokeratology response. Check out the courses page for whats currently available to help your eyeballs thats the magic words you need to whisper conspiratorially, for anyone in the mainstream to acknowledge the. The first contact lens specifically designed for your. Orthokeratology is fitting custom designed, high oxygenpermeable contact lenses to reshape the cornea in a controlled manner to correct ametropia. I have been using orthotool for the past few years for most of my initial orthok fitting and the success rate improved in a.
The central portion of the lens is the treatment zone or base curve bc. The lens may be fitted either empirically via the internet through a direct connection between the corneal topographer and. Orthokeratology is nicknamed orthok and sometimes called corneal reshaping cr, corneal refractive therapy or vision shaping. We offer single vision, keretaconus, toric and ortho k rgp lenses to meet the needs of each of your patients. To evaluate the preliminary clinical outcomes of a new contact lens design for orthokeratology in hyperopia. With a reverse geometry design, the rigid contact lens is able to flatten the center of the front corneal surface by the pressure induced from the tear. Simply pop your orthok lenses in before bedtime, remove them in the morning, and wake up to world of clear, sharp, natural vision. Fitting the dreamlens is straightforward and has been found to have a success rate over 90%. Ortho k lenses have a reverse geometry design consisting of three curves figure 2. Fifty myopic children aged between 9 and 14 years were. Orthokeratology lens an overview sciencedirect topics.
It took a long time to achieve only a shortterm reduction of. Curvature maps and axial diametre measurements work in conjunction with computer software such as eyespace, to design the lenses refer to figure 4. It took a long time to achieve only a shortterm reduction of myopia. A branded, patented product and a few thousand of your dollars per year. Control singlevision spectaclewearing subjects were selected from the control group of a previous progressive lens study by edwards et al. Orthokeratology is defined as the temporary reduction in myopia by the programmed application of rigid gaspermeable contact lenses. Other case reports used the same design, as did the first studies on toric orthok lenses for astigmatism. The anatomy of ortho k lenses has undergone a significant transformation since the 1960s, when the idea was first put into. This study aims to analyze two commercial orthokeratology lens designs and compare their optical effects at the corneal level. The following will discuss candidates for myopia management with ortho k, basic lens design for myopic ortho k, characteristics of a good fit, and how to troubleshoot common topographical corneal responses after ortho k fitting. It is also ideal for those contact lens patients who have been unable to wear their contacts because of dryness or redness.
Using boston materials, you fit customdesigned orthokeratology lenses to reshape your patients corneas overnight, so they may enjoy clear vision throughout the daywithout glasses, contact lenses, or surgery. Some new orthok lens designs are also available for farsightedness and presbyopia. With either method, it is important to remember that centration of the lens over the cornea is the key to success in orthokeratology. Whether it is the fda approved fargo lens or the advanced isee orthok design. Software orthotool custom contact lens design software. Trouble shooting guide for ortho k lenses the basic design of the third generation e lens for orthokeratology 1. Orthokeratology a guide to overnight orthokeratology. We proudly design and manufacture a variety of orthokeratology rgp lenses, also known as corneal reshaping technology to help reshape the way the world sees. Orthokeratology with a new contact lens design in hyperopia. Morphology, topography, and optics of the orthokeratology.
Contact lens wearers that have developed dry eyes, discomfort or sensitivity to their lenses. Prospective pilot study including 8 hyperopic eyes of 4 nonpresbyopic patients 2444 years undergoing orthokeratology with the alexa h contact lens tiedra pharmaceutical, madrid, spain, which is an aspheric pentacurve design. This orthok lens is manufactured using highspeed computer assisted lathes and made from an advanced highly oxygen permeable material which allows your eye to breathe overnight and maintain excellent health. High myopiapartial reduction orthokeratology hmpro. The ortho tool software purchase was the best investment that i ever made practicing orthok along with the trial set to define the lens design.
In late 2004 a study published in an international journal found that orthokeratology can slow myopia progression by an average of 50% 10. Day is an independent lens designer and a consultant for orthokeratology in private practice in hoover, ala. Click on the link below to certified to fit the visionary mg ortho k lens. I have been using orthotool for the past few years for most of my initial ortho k fitting and the success rate improved in a great deal when the diagnostic fitting was incorporated.
We offer single vision, keretaconus, toric and orthok rgp lenses to meet the needs of each of your patients. Orthokeratology has grown dramatically internationally. Jaume paune fabre barcelona, spain, an optometrist, developed an ortho k lens to correct hypermetropia. To investigate changes in subfoveal choroidal thickness sfcht during orthokeratology ortho. Orthokeratology orthok vision shaping treatment vst. Pdf analysis of two orthokeratology lens designs and. Reversegeometry lenses have since been designed to improve the centration and refractive effect of the lenses. In addition, socalled night therapy is now practised in most developed countries. Optic zone base curve, compression zone, bc width 5. Jul 15, 2012 today, several companies manufacture orthok lenses. The dreamlens does not incorporate diagnostic fitting and only requires ks and spectacle rx for use with the dreamlens proprietary software design program. Heres an email on the topic, which is discussing orthok side effects, getting jakey straight onto this whole tangent.
If you want to get started improving your own eyesight, i offer a number of courses, including options for oneonone support with me personally. Thats what it takes to discuss the elephantintheopticshop, of myopia control. Mar 01, 2017 although advances in ortho k have led to the creation of lenses designed to treat hyperopia and presbyopia herzberg, 2010, this article focuses on myopic ortho k lens design. New reverse geometry contact lens designs and materials have.
Orthokeratology is a nonsurgical treatment that uses precise, specially shaped contact lenses to temporarily reshape the cornea in order to eliminate nearsightedness or myopia so that you can see better at distance without wearing eyeglasses or regular contact lenses throughout the day most often the doctor will prescribe specially designed rigid gas permeable rgp contact lenses that. They can be for ortho k or regular use including sclerals, and the program will then communicate the points file directly to the lathe in the laboratory. The cheshire eye clinic, 75 alderley rd, wilmslow sk9 1pa. Ortho k and crt are both more costly at startup than normal contact lenses and eyeglasses. Visionarys ortho k system defines efficiency with an easy to fit design and an automated tool that makes designing quick and accurate. Jaume paune fabre barcelona, spain, an optometrist, developed an orthok lens to correct hypermetropia. Oneyear effect of wearing orthokeratology lenses on the. The cornea is the domeshaped, clear area over the pupil, which protects the internal workings of the eye. The new orthokeratology designs have allowed the reshaping process to take place. This allows your doctor to create a custom lens specifically designed for each of your eyes and its unique visual problems.
Click on the link below to certified to fit the visionary mg orthok lens. Trouble shooting guide for orthok lenses clover sites. About 5 percent of the lens market in 2011 was orthokeratology lenses, which grew to about 19 percent by 2016, likely as the rate of myopia sufferers increased. To report the study design and preliminary results of a pilot study, high myopiapartial reduction orthokeratology study. The overnight lenses are made from boston equalens ii material. Over 80% of orthokeratology fits on adolescents are for myopia. Reim is an independent orthokeratology lens designer in private practice in indian harbor beach, fla. Similar to traditional orthokeratology contact lens fitting, the base. Reverse geometry orthok lens effective for postrefractive surgical case. Being on the cutting edge of lens design and manufacture for over 40 years, you can hold the confidence that you are using the best gp contact lenses in the world.
A study to determine corneoscleral ortho k lens csokl safety and application was conducted on thirty subjects by cary herzberg, more than ten years ago 12, who registered a patent of a. Strict manufacturing and quality standards paragon crt contact lens manufacturing standard tolerances are maintained at the micron level to ensure high quality lenses. The availability of innovative lens designs, particularly reverse geometry lenses, and the ability to design and manufacture lenses to produce a specific tear layer. Microsoft word large lens orthok design perspective. It is claimed by eyespace, a similar system, that this can achieve a 79 per cent first lens success rate. In june 2002, paragon vision sciences corneal refractive therapy lens was the first orthok design to gain fda approval for overnight wear. Bard is in practice in dallas, texas, where he specializes in orthokeratology and dry eyes. Orthokeratology also known as orthok, ok, corneal reshaping, corneal refractive therapy, and vision shaping treatment is an alternative method to correct refractive errors using customdesigned rigid lenses to temporarily modify the curvature of cornea.
Change in subfoveal choroidal thickness secondary to. For a given cornea, an analysis is carried out, of which reverse geometry lens design is most appropriate to ensure both a reasonably large area of corneal flattening and good lens centration. Orthokeratology orthok ckr design for orthokeratology. Nightwear ortho k solutions were available to consumers in many countries outside the us much earlier than within the us, due to international differences between regulatory controls and bodies. The ortho tool software purchase was the best investment that i ever made practicing ortho k along with the trial set to define the lens design. Although advances in ortho k have led to the creation of lenses designed to treat hyperopia and presbyopia herzberg, 2010, this article focuses on myopic ortho k lens design. Wearing orthok lens can solve the problem of myopia progression but more evidence is still.
K lens wear and after its cessation and the association of short. Ortho k allows you to perform your daily activities without the hassle of cleaning your eyeglasses, lubricating your contact lenses or carrying around eyeglass cases andor contact lens supplies during the day. Ok esystem lens contex ok esystem lenses set the standard for overnight orthokeratology by offering the most advanced topography based fitting as well as empirical, trial or. Research has also demonstrated that orthokeratology. Further work is being conducted by pauline cho, the cclru and many others on the use of orthok in myopia control in young myopes. Further work is being conducted by pauline cho, the cclru and many others on the use of ortho k in myopia control in young myopes. Jun 14, 2018 depending on the fitting philosophy of the design being used, an initial base curve is chosen that is 0. Whether it is the fda approved fargo lens or the advanced isee ortho k design. Dreamlens orthokeratology art optical contact lens, inc. Orthokeratology principles and practice orthokeratology principles and practice pdf pdf orthokeratology principles and practice pdf download. The longitudinal orthokeratology research in children.