Tag Archives: astigmatism

Study Finds Nearsightedness Slowed in Children With Contact Lenses

It’s good to see another study indicating that Orthokeratology Contact Lenses prevent the progression of nearsightedness (myopia).  The Controlling Astigmatism & Nearsightedness in Developing Youth Study (CANDY) was based on a relatively small population (28 patients) and it would have been good to see the rate of myopic progression after removing the contact lenses over a greater period of time, however the data was compelling and warrants further study.

As eye doctors we are often asked if we can prevent the progression of nearsightedness in children.   Clinically, we feel that the answer is probably yes, however there are relatively few studies that have investigated this common question.  The CANDY Study backs up what we feel our clinical experience has taught us.  The progression of nearsightedness in CANDY study patients was 0.37D prior to wearing overnight Ortho-K contact lenses.   When the patients discontinued wearing their lenses they found that the patient’s refractive error, on average, had increased by only 0.03D.

An FDA sponsored study of 300 children started in 2007 and is expected to continue for 5 years.  Hopefully, the FDA study will answer more of our questions.  Additional findings from the CANDY Study found that the younger the child the more beneficial was the effect on controlling myopia and the technique was more convenient.   A more comprehensive look at Orthokeratology including a link to the CANDY Study is available on the Total Eye Care website.

Astigmatism, it’s not a Disease

Many people feel astigmatism is a bad, progressive disease. Actually astigmatism is caused when light focuses in two points in the back of the eye because the eye is not in the shape of a sphere. An eye with astigmatism has often been described to be in the shape of an egg or football, to some degree this is true, though an astigmatic eye is not exaggerated to that degree. Most people have some astigmatism. Visually, a person with uncorrected astigmatism will often see a faint shadow on letters or objects.

Emmetopia is when an image focuses on the retina. A person that is emmetropic has uncorrected “normal vision”.