The Houston study found that not only do hard lenses successfully slow down the process of myopia, the benefit persisted when the contact lens wear was resumed after being discontinued for a few months.
Between the ages of seven and 11 years, six percent of the population has 0.5 dioptres (the unit used to measure short-sightedness) or more of myopia.
The big jump in myopia comes between ages 12 and 13 with an increase of 25 percent in young people who have a 0.5 dioptres.
The way in which rigid lenses stabilise myopia is thought to be either by flattening the growing cornea, or by restraining axial elongation of the eye. (i.e. in both cases, preserving the correct eye shape).
Rigid lenses are the most effective in retarding the onset and progression of myopia.
- Information supplied by the University of Houston Contact Lens Institute 1992 -
We are indebted to the Eyecare Trust for providing the content for this section