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Transcript of Orthokeratology
N F D
Z X T P
F T D Z U
H T P N F D
Z R D T N U H P
Sarra Ben Amor
What is Orthokeratology
(known as Ortho K)
Advantages of Ortho K
Safe and reversible
Uses a unique process that can help to eliminate the use of contact lens or glasses during the day
Can prevent a child’s nearsightedness from getting worse
Ease of lens care
Often the best treatment for nearsightedness up to -4.00D and a cyl of less than -1.50D.
Is a nonsurgical procedure that uses a specially designed contact lens to reshape the curvature of the eye in order to improve vision
Who is a candidate for Ortho-k?
People with progressing myopia
Low to mild myopes (-4.00D or less)
8 - 60/70 years of age
Better success under the age of 40
Dry eye syndrome
Large pupil size
High myopia (*varies from doctor to doctor)
Hyperopes (*varies from doctor to doctor)
Eye disease or abnormally shaped cornea
• In 1971 Leonard Seidnar O.D. and polymer chemist Norman Gaylord developed polycon
• In 1989 Richard Wlodyga O.D. and Nick Stoyan developed Accelerated Orthokeratology
• June 13, 2002 the Paragon Vision Sciences’ CRT system was approved by the FDA for overnight ortho-k
How long do they last?
The lenses should be replaced around 12 to 18 months.
How long does it take to give
crisp clear vision?
1st and 2nd week – notice improvements
3rd and 4th week – full effects will be apparent
High prescription – improvements in 2 to4 weeks
Children – faster results compared to adults
How often do you need to get checked
During the first 6 months of wearing ortho-k lenses you will to get checked regularly
After the initial 6 months, regular bi-yearly appointments are necessary to get checked to ensure the good health of your corneas and the best performance of your lenses
How they check
Corneal topography- technique for
mapping the surface curvature
of the cornea
*Warm colors such as red and orange show steeper areas;
cool colors such as blue and green denote the flatter areas*
Cost Comparison Chart
OrthoK Lasik OrthK Cost Andvantage
High $2,500 $6,000 -58%
Medium $2,000 $4,000 -50%
Low $1,500 $4,000 -50%
• There are additional costs for replacement ortho-k lenses, lens care solution and follow up exams, which can add up to about $300 - $500 per year
Reviews, Pamphlets, Brochures, Articles
Where to find info
Ontarios Ortho-K’s Doctor
Edward S Chow OD Markham Ont. Canada
Betty Frretz, O.D., F.A.A.O. Listowel Ont. Canada
Albert S. Y. Ng, O.D., F.A.A.O., FIOA Toronto Ont. Canada
Kevin Lin Optician Markham Ony. Canada
Jeffery Ng, O.D. Mississauga Ontario
Christine Yeung, O.D. Oakville Ontario
Who Performs It
There are quite a few doctors and opticians that and trained to perform Ortho-K. You can pick what doctor you want based on who’s closest, who you feel would do the job best or who is recommended.
• individuals who contributed to the development of Orthokeratology
• In 1962, George Jessen O.D. was the one to attempt in changing refractive myopic error
• mid-sixties the International Orthokeratology Society was established
Ortho-K vs. Laser surgery
Modifiable and reversible
No healing and recovery time needed
Can help with dry eye symptoms
Possible side effects and complications wearing ortho-k lenses
More options for children
Good for sports
Permanent and invasive
Healing and recovery time needed
Dry eyes can worsen
Possible side effects and complications with the surgery
Consult doctor for sports*
H P X T Z F N W D
Disadvantages of Ortho K
Not a permanent solution
Higher start-up cost than regular contacts or eyeglasses
Currently only for myopia
be prepared for 6 to 8 visits to the optometrist over 12 months.