Tired from wearing glasses, mid-day dry eyes from wearing contact lenses or vision getting blurry from eye strain due to long working hours in front of digital screens? My vision can get so blurry that I’m unable to work for the rest of the day. Eye drops or glasses couldn’t help, all I can do is to give my eyes a break or call it a day.
Lasik may solve the problem but I’m not sure I’m ready for it. I was introduced to Ortho-K(OK Lens) as known as Orthokeratology/Cornea Reshaping Therapy(CRT) at W OPTICS. All I need to care about was the maintenance for these hard lenses (pretty much similar with monthly contact lenses). Apart from managing myopia progression in children, adults can also benefit from the effect of wearing these overnight lenses too.
Basically, you need to wear it to sleep and take it off the next day when you wake up, you’ll have clear vision without the need of glasses throughout the day. So this cycle repeats every day. I have summarised a list of my questions about Ortho-K treatment.
Measurement taking of the cornea for making customised Ortho-K lens
Cornea health check for Ortho-K suitability. Based on your eye health and lifestyle, not everyone are suitable.
Can Ortho-K correct astigmatism? How high?
Orthokeratology, Ortho-K lens or in short OK lens can correct most form of astigmatism except the residual type of astigmatism (Astigmatism that arises within the eye). However, Mr Chew, W OPTICS group of optometrists, mentioned that residual type astigmatism happens in only about 10% of cases. Astigmatism of up to -4.00 degrees can be corrected in advance customised Ortho-K fitting.
Blue and green tinted OK lens to differentiate left and right
Can I see clearly the next day once worn? Any adaptation period?
The softer the cornea of an individual, the faster will be the prescription change after overnight Ortho-K lens wear. But in general for low prescription of less than -2.00 degrees, after the first overnight wear, will be able to see well enough the next day. “Adaptation for Ortho-K is generally quick as most users adapt to the lens within 3-4 overnights wear” Ms Yee Leen, W OPTICS group of optometrists.
I’m able to see well without glasses/contact lenses after one night of wearing Ortho-K lens
How long does the Ortho-K effect last? Do I need to bring my spectacle if I’m having a long day out?
“You’re unlikely to need your glasses even with a long day out. The Ortho-K effect will last through the late evening in majority of cases. Some exception may be in very high prescription of short-sighted of -6.50 degrees & higher.” The effect of Ortho-K lens lasted for almost 12 hours till I need my glasses again.
Image of my right eyes wearing Ortho-K lens.
Is Ortho-K comfortable?
For the first 3-5 days, you can feel the hard lens more, after which the feeling is similar to wearing a soft contact lens.
W OPTICS optometrist, Serene teaching me how to wear my Ortho-K lenses
What are the 3 common reasons adult choose Ortho-K instead of other alternatives?
“Sports, dry eyes with soft contact lens and the weight & appearance of glasses are the three most common reasons for adults to choose Ortho-K lens. Another common reason was the long hours of computer work. Not wearing any contact lenses and glasses after Ortho-K shaping treatment makes one feel more natural and relax at work. Others are because in their line of work that wearing glasses are not allowed or encouraged. There are also appear to have more cases of late-onset adult myopia that are related to intense near work too.” said Mr Chew.
Can I wear beauty contact lens if I’m on Ortho-K?
It is advisable not as we should let our eyes breathe and rest normally after the overnight wearing of Ortho-K lens.
Can Ortho-K correct long-sightedness (Presbyopia)
“Ortho-K can be used to correct long-sightedness (hyperopia or presbyopia 老花). Long-sightedness can happen to any age group or race but more common in Europeans, whereas presbyopia is due to the natural aging of our crystalline lens that makes near reading difficult. However, the treatment zone will be smaller for such design. Therefore the individual lifestyle needs and pupil size of the eye need to be taken into account before going onboard with Ortho-K treatment for this group of user.”
If I stop wearing Ortho-K, how long it takes for my myopia return back to normal?
“That depends on your cornea rigidity, prescription and how many years you’ve been wearing Ortho-K. In general, it‘s about 6-8 days.”
If I stop wearing Ortho-K, will my myopia or astigmatism worsen?
“For children age 5-15 years old, whether myopia management is 50% or 80% effective will, of course, have a bearing in the final power after they stop using Ortho-K lens.”
“In adults, if you stop Ortho-K, your cornea shape will go back to original after 2-3 weeks and your short-sighted & astigmatism will return to pre-treatment power after 6-8 days.” It took me 5 days for my power to return after wearing it daily for a month.
Is it necessary to wear digital(computer) or UV lenses spectacle when on Ortho-K?
“In 90% of cases, you do not need to wear another pair of glasses to help you see clearer, but if you want to block out more blue light due to long hours of computer work or UV protection from long hours of exposure under hot sun, you can consider an option to wear glasses for it. Currently, I’m wearing Crizal Eyezen, an Essilor lens with 100% UV protect and Prevencia coating.
OK lens kit received at W OPTICS with all the solutions required for cleaning and maintenance
Ortho-K(OK Lens) is available at selected W OPTICS stores
W OPTICS Suntec City #01-400, Opens daily 10:30am – 9:30pm, +65 6730 1303
24hrs Contact Lens hotline: +65 8522 7799 (Call/Whatsapp)
About W OPTICS
W OPTICS is the fastest growing home-grown vision care centre in Singapore, providing optical solutions and products at the forefront of the industry. Offering tailored vision care services that cater to the specific needs of customers, making each client’s visit distinct and exclusive. The W EYExperience offers eye examination that is tailored to individual needs, ranging from standard to a premium comprehensive eye examination necessary for the tech-savvy generation to screen/diagnose different eye conditions or eye diseases. woptics.sg
厌倦了戴眼镜吗？长期戴隐形眼镜会让眼睛变得干燥和长时间在电脑前工作会导致眼睛疲累而视线变的十分模糊就连眼药水都没用了。虽然lasik拉西克手术能解决这些问题，我选择了Ortho-K(OK Lens)/Orthokeratology /角膜重塑疗法Cornea Reshaping Therapy(CRT)在W OPTICS. 过程只需要确保镜片的保养和卫生，几乎和平常的隐形眼镜管理一样。Ortho-K 能帮助管理孩童们的近视问题，成年人也能有益于 Ortho-K效果。
膜越软，Ortho-K镜片矫正的处方变化就越快。但一般来说，对于低于-2.00度数，经过第一次隔夜穿戴后，第二天就能看得清楚了。Ms Yee Leen，W OPTICS验光师 说Ortho-K的适应性通常很快，大多数用户只需要3到4次的穿戴后就能适应镜片了。
W OPTICS Suntec City #01-400, 每日10:30am – 9:30pm, 预约号码：+65 6730 1303
24hrs 隐形眼睛／Ortho-K热线: +65 8522 7799 (Call/Whatsapp)
Content contributed by:
Luo M, Ma S, Liang N. Clinical efficacy of toric orthokeratology in myopic adolescent with moderate to high astigmatism. Eye Sci. 2014;29(4):209–213. 218
Paune J, Cardona G, Quevedo L. Toric double tear reservoir contact lens in orthokeratology for astigmatism. Eye Contact Lens. 2012;38(4):245–251.
Swarbrick HA. Orthokeratology review and update. Clin Exp Optom. 2006;89(3):124–1433.
Comfort & Vision Scores at insertion & Removal during month of wear – IGO UK Eyes & Contact Lens 2011 volume 37.
Young adults age 20-30 years have develop late onset Myopia that has coincided with intense near work & computer – Sheedy , Shaw-McMinn 2003