Frame selection is function there are two factors to consider:
(A) the disposal lens frame features
When
the frame is selected, consideration should be given to the interaction
of the lens: the larger the frame size, frame larger the effective
diameter, larger the required minimum lens blank, after cutting edge
lenses thicker, heavier. High degree lenses and
aspherical lens, where small size, symmetry, a circle or a square frame,
and a belted long frame would be inappropriate. Gradient
filter you need to have the appropriate height of the frame, from the
center of the pupil to mirror inside bottom of a vertical distance of at
least 22 mm.
For a high degree of astigmatism lenses, needs to take into account most mirrors the radial direction. +6.00/-4.00*180
lenses, you need to select a much narrower, height, large frame, height
frame than larger, so that the top and bottom edge thickness is not too
thick. While +6.00/-4.00*90 lens to select the width, height and lighter frames.
In
patients with high myopia when wearing glasses, because poor spherical
and chromatic aberrations of optical lens image distortion caused, as
glued to the surface of the cornea and contact lenses, pupillary area
receiving incident light only, minimal lens optical distortion, wear
cannot be detected. Glasses, especially height of
glasses to wear nose weight, noses, and ears often frame oppression
caused by Dermatitis, itching blisters, whereas the contact lenses do
not have this problem. If wearing glasses from the cold outdoors to a warm indoor vapor condensation. Wearing contact lenses you can avoid glasses covered eyes, eyes communicate feelings. Suggestions you might consider matching contact lenses
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