"Conclusions: Permanent low myopic defocus of the image in
binocular spectacle format inhibits eye growth and refraction
shift to myopia in children with low hyperopia, emmetropia and
low myopia. The method of alternating monolateral low myopic
defocus arrests the myopia progression in 81.8% of children
with low myopia for 4 years and 66% for 7 years. "
1st group was just at risk for myopia, and wore preventative plus lenses to correct to 1D. “During the 9-year follow -up period no cases of myopia onset were observed.”
" Ultrasound biometry revealed that this shift was caused by thinning of the crystalline lens and deepening of the anterior chamber. "
- thinning of the lens can be bad. This might be why some people report more floaters. If you thin your lens too much, you loose eye pressure.
"changes of the anterior chamber depth and the thickness of the crystalline lens initially induced by positive spherical lenses persisted over the follow -up period accompanied by inhibited axial growth. "
2nd group was low myopic, and wore lenses that corrected one eye for distance (+0.5D), and the other for near (+1.5D), two pairs of glasses were used alternatively to work both eyes over time.
2 patients in 2nd group developed binocular vision problems and had to stop the treatment. They recovered after stopping treatment.
(81.8%) had stable refraction, which grew not more
than ͔0.5D over the whole follow up period
“Ultrasound biometry revealed an insignificant increase in
the axial length”
"It is also possible that the most important factor
is not a particular type of ciliary muscle contraction but the
periods of defocus which are inevitable and recur in the course
of the day due to ciliary muscle fatigue and relaxation. "
word of the day - cycloplegia - paralysis of the ciliary muscle of the eye, resulting in a loss of accommodation. Because of the paralysis of the ciliary muscle, the curvature of the lens can no longer be adjusted to focus on nearby objects.
“Obviously, myopia occurs when the potentials of this emmetropizing mechanism are exhausted.” - implying that there are limits to how much this can work
"low myopic defocus induced by positive spherical lenses and natural defocus induced by the onset of myopia have the same effect on the accommodative -crystalline apparatus"
- Day long minor de-focus caused patients to be more far sighted and was protective against myopia progression for 9 years.
- Don’t mess with binocular vision.