Although orthokeratology is effective, it is only as effective as the commitment of the. The forge orthok range of lenses has a number of designs capable of correcting a wide range refractive error, including astigmatism, and is available in rotationally symmetric, toric, and quadrant. Orthokeratology, also known as orthok, is a nonsurgical process that improves vision. Your doctor is trained to use wave contact lens design software to custom design a l e ns that perfectly fits your. Advances in highoxygen breathable lens materials, computeraided lens design software and precision lens shaping technologies, orthok night lenses are now safer, more comfortable, corrects a wider range of prescriptions and give more predictable results than was previously possible.
Night lens therapy providers actually capture a digital image of your corneas to create a finger print map right of your cornea. Dreamlens orthokeratology art optical contact lens, inc. In the most basic of terms accelerated overnight orthokeratology or orthok is the science of changing the curvature or shape of the cornea to change how light is focused on the retina at the back of ones eye. Rozenberg earned his doctor of optometry, cum laude, from the southern california college of optometry. Wave designs a custom lens that duplicates your corneas. Orthokeratology contact lenses reshape the cornea overnight to provide clear vision during the day without the need for contact lenses or glasses during those daytime hours. In general, crt can cost up to four times more than standard rigid gas permeable lenses due to the complexity of the lens design and the programs requirement that you visit your optometrist several times during treatment. Fitting software is used to construct the initial custom order and optimize the results when modifications. Software orthotool custom contact lens design software.
Research suggests that both trial lens fitting and software fitting approaches are effective in temporarily reducing myopia, providing good. Doctors also use wave software to create custom orthokeratology lenses, a gentle, reversible, nonsurgical vision correction procedure. By fitting the patient into a reverse geometry gas permeable lens, the practitioner can make controlled but temporary refractive changes to the cornea. Ten subjects required a total of 35 adjustments to attain an optimum lens fit. These specialty contact lenses can be great for children, athletes, or those with jobs or lifestyles that make glasses or contact lens wear very difficult. 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. Our contact lens specialty service at pacific university uses the orthotool lens design software on a daily basis for many of our normal and complex patients that require customized rigid lens designs. Orthokeratology orthok treatment for myopia prevention and. It took a long time to achieve only a shortterm reduction of myopia. For the practitioner who would like to begin fitting orthokeratology lenses, some useful tools are available. Contact lens spectrum troubleshooting orthokeratology. Aug 09, 2018 research suggests that both trial lens fitting and software fitting approaches are effective in temporarily reducing myopia, providing good uncorrected visual acuity ucva and delaying the elongation of axial length for moderate and high myopic adolescents. Orthokeratology is a specialty type of contact lens fitting in which the patient wears correction overnight and is free from wearing visual correction during the day. Some lenses are designed simply from flat k measurements, while custom lens design software may require eccentricity and r 0 as well.
Wave corneal molding is the most advanced type of orthok. Fitting orthok for a patient with high myopia global. Fitting orthok for a patient with high myopia global insight. The be free advanced ortho k lens system is a new evolution in myopia management with a software driven design. Eyespace software for rgp lens design available at. Myopia management conference agenda global council on. The central portion of the lens is the treatment zone or base curve bc. Forge orthokeratology available at innovative contacts. Pdf analysis of two orthokeratology lens designs and. Orthok are special nighttime contact lenses worn during sleep to restore clear vision without glasses. Wave software recommends a starting custom lens design regardless of whether its a single vision, front surface multifocal toric or bitoric, ortho k, toricortho k. The control lens was the pj design manufactured by capricornia contact lens pty ltd australia and manufactured in boston xo material. Advances in highoxygen breathable lens materials, computeraided lens design software and precision lens shaping technologies, orthok.
While expertise in orthok lens design may seem more relevant for. Using the same wavefront technology as in wavefront guided lasik, a corneal mapping topographer captures 14,000 measurements of the entire corneal shape, and imports them into a highly sophisticated computer software lens design program. Fitting mixed astigmatism with orthokeratology lenses. Orthokeratology a guide to overnight orthokeratology.
Doctors also use wave software to create custom orthokeratology lenses, a gentle. He is a partner in private practice conducting clinical research on use of contact lenses and orthokeratology to control progression of myopia, and holds an adjunct senior lecturer position at the. This course will introduce the most modern orthokeratology lens on the market today, the be free. They note that the two approaches can be combined when fitting orthokeratology ok lenses. Retrospective case studies, a less stringent study design, have show high rates of prevention. Orthotool simplifies your workflow, saves you time, and helps you and your patients visualize complex lens designs. Perhaps in future designs, a combination of r 0 and eccentricity may become more widely used compared to flat k, as it better represents corneal shape with regard to orthokeratology. Developed using eyespace lens design software, forge orthokeratology lenses are the next generation of custom designed orthokeratology lenses.
Fitting software is used to construct the initial custom order and optimize the results when modifications are necessary. Euclid systems orthokeratology oprifocon a contact lenses. This resulted in corneal distortion and problems such as increased i. 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. The designer has the option of four peripheralcentral lens design combinations. Orthotool software enables optometrists to quickly design custom orthokeratology contact lenses for even complex cases. Reducing treatment zone diameter in orthokeratology and its. A good way to imagine orthokeratology is to think eye braces orthok customised rigid contact lenses slowly and gently reshape the front surface of the eye, like how invisalign and braces shape teeth. Mar 01, 2017 some lenses are designed simply from flat k measurements, while custom lens design software may require eccentricity and r 0 as well. American academy of orthokeratology and myopia control. Eyequip developed the wave contact lens design software, which enables practitioners to design single vision, front or back surface multifocal or orthokeratology rgp lenses.
Nov 04, 2010 of the 31 subjects that were assigned orthokeratology contact lens wear at baseline, an optimum lens fit was obtained in 21 subjects with the first contact lens fitted in accordance with the menicon professional easy fit software. The be retainer is an orthokeratology lens design built entirely from corneal topography data. May 22, 2018 while doctors first discovered that they could reshape lenses decades ago, orthokeratology is still a pretty new area of practice. Orthok lenses have a reverse geometry design consisting of three curves figure 2. The eyespace software is capable of simulating any type of rgp lens, from a simple rotationally symmetric gas permeable lens, right through to a quadrantspecific reverse geometry orthokeratology lenses. Our current software allows contact lens fitters to enter traditional patient information ks and spectacle rx, suggests the presence of certain pathology, makes lens design suggestions, and allows the user to point and click a number of different. With nearly 4 decades of experience in eye care and custom contact lens design, dr. Orthokeratology often called orthok or ok lens for short is a form of safe, reversible and nonsurgical vision correction available to both adults and children. Orthok uses specially designed contact lenses to gently reshape the curvature of the cornea the front surface of the eye to bring the eye into correct focus.
Reducing treatment zone diameter in orthokeratology and. Clinical trials which can be found in the research menu under orthokeratology orthok have reported slowing myopia 55% to 100%. This lens is a proprietary 4 curve ok lens design comprising an aspheric back optic zone boz, two spherical intermediate curves and a peripheral tangent flat. The program utilizes the mathematics of wavelet theory from topographic data and creates a digital signal to describe the cornea. It is a treatment that has been proven to be safe and. Your doctor is trained to use wave contact lens design software to custom design a l e ns that perfectly fits your eye and your needs. Eye fitted with euclid systems orthokeratology oprifocon a contact lens. Orthokeratology is defined as the temporary reduction in myopia by the programmed application of rigid gaspermeable contact lenses. Ther karrinyup, western australia abstract orthokeratology is the reversible technique of reshaping the cornea by structural changes to the corneal epithelial cells. We are a nonprofit organization of practitioners and academics devoted to the science and education of orthokeratology and myopia control.
The be free design offers a family of lenses for a wide range of potential orthokeratology patients. Contact lens spectrum fitting orthokeratology contact lenses. The dreamlens does not incorporate diagnostic fitting and only requires ks and spectacle rx for use with the dreamlens proprietary software design program. More designs including 5 controlled clearance orthokeratology designs.
Tangential maps for first pair at 1 month follow up. Potential contact lens applications are outlined, including the design and oneye performance of singlevision lenses, lenses for presbyopes and keratoconics, orthokeratology, tear film studies. Comparison of toric and spherical orthokeratology lenses. Myopia usually begins in childhood at school age six years and onwards and can worsen until early adult years. Your doctor will specify the lens diameter and thickness for comfort and adjust the position of the optics for best visual performance. These designs were flatfitting, commonly decentering up or down. I have been using orthotool for the past few years for most of my initial orthok fitting and the success rate. Some lenses are designed from flat keratometry flat k measurements, while custom lens design software may require eccentricity and apical radius of curvature measurements. Myopia control with orthokeratology contact lenses in. Stephen rozenberg provides bestinclass expertise to understand the vision needs of each patient. This empirically ordered lens requires corneal shape information along with the visible iris diameter and rx. 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. It features a robust fitting software that predicts good from bad ortho k candidates prior to treatment. Rgp contact lenses design has never been more scientific and precise.
Orthokeratology lenses precision technology services. New reverse geometry contact lens designs and materials have. Research suggests that both trial lens fitting and software fitting approaches are effective in temporarily reducing myopia, providing good uncorrected visual acuity ucva and delaying the elongation of axial length for moderate and high myopic adolescents. The lens corneal angle of bearing can be best visualised and assessed by the cross section tear layer profile of the alignment zone. I have been using orthotool for the past few years for most of my initial orthok fitting and the success rate improved in a great deal when the diagnostic fitting was incorporated. The design of the ok lens would flatten the central cornea by the central flat zone. The ideal fit is one where the lens corneal angle is slightly negative tear layer thickness reducing from inner to the outer aspect of the alignment zone in the horizontal meridian and slightly positive in the. Eyespace will intelligently design an appropriate forge myopia rotationally symmetric spherical or toric orthokeratology lens with the given corneal topography data.
It wasnt until recently that computerized corneal topography technologies and advancements in gas permeable lens design and manufacture made orthokeratology a good treatment option for myopia patients. The 8 to 18 market, referred to as tweens and teens, who have myopia benefit from orthokeratology with paragon crt contact lenses. Slowing myopia down with orthokeratology clarendon. Dr paul gifford consults with the contact lens industry on development of contact lens designs and their implementation into clinical practice. Free version of the winlens3d optical design package, which provides serious design and analysis tools for optical engineer, student or designer. It is also known as corneal reshaping technology crt and lenses are worn while sleeping, giving you clear vision during the day without the aid of. The orthotool software simplifies your workflow, saves you time, and helps you and your patients visualize complex lens designs. Wave trained doctors are skilled and certified to use wave contact lens design software for contact lens patients requiring correction of near or distance vision, astigmatism, combined reading and distance vision, keratoconus and post surgical corrections. 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. Ortho k lens calculation software suggested an initial lens design, however it was decided to flatten the suggested peripheral curves by 0. Myopia control with orthokeratology contact lenses in spain.
Our current software allows contact lens fitters to enter traditional patient information ks and spectacle rx, suggests the presence of certain pathology. Euclid systems orthokeratology oprifocon a contact. The ability to clearly visualize each gp lens parameter has brought a new level of fitting clarity and success to our practice. Euclid systems orthokeratology oprifocon a contact lenses are designed to purposely net match the shape of the cornea but instead apply slight pressure to tde center of the cornea, in a design known as reverse geometry. Of the 31 subjects that were assigned orthokeratology contact lens wear at baseline, an optimum lens fit was obtained in 21 subjects with the first contact lens fitted in accordance with the menicon professional easy fit software. Orthotool is the current iteration of contact lens design, modeling, and manufacturing software which has evolved over the last 25 years.
In order to correct distance refraction with orthokeratology, i need to create 1. Custom design the lens using eyespace contact lens design software. Orthokeratology, or orthok for short, is a nonsurgical and reversible procedure in which customdesigned contact lens devices are used to gently reshape the cornea front surface of your eye. Our roots go back to the very beginnings of orthokeratology and as such our board and membership not only represent the pioneers of orthok, but also those dedicated to pushing this field to new heights. Using a diagnostic fitting set, empirically ordering the lenses through consultation or designing a lens using topography software are other options when fitting orthok lenses figure 1. These lenses are larger in overall diameteroften 90% to 95% of the total hvid. Fitting mixed astigmatism with orthokeratology lenses eyespace. Slowing myopia down with orthokeratology clarendon vision. Can orthokeratology lens design be modified to alter peripheral refraction. Fitting the dreamlens is straightforward and has been found to have a success rate over 90%. While doctors first discovered that they could reshape lenses decades ago, orthokeratology is still a pretty new area of practice. Conference global council on myopia management 2019. Orthokeratology orthok treatment for myopia prevention. The following chart is from a study by wilcox and bartels.
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