-
Bifocals are eyegl****es with two
distinct optical powers correcting vision at both long and
short distances.
Bifocals are
commonly prescribed to people...
-
rounded bifocals and D
segment bifocals, that are
selected for
functional differences as well as the
visual demands of the patient.
Bifocals allow people...
-
would be −2.5 diopters.
Trifocal lenses are made in
similar styles to
bifocals, but with an
additional segment for
intermediate vision above the reading...
-
plastic aviators. Adjustable-focus eyegl****es
might be used to
replace bifocals or trifocals, or
might be used to
produce cheaper single-vision gl****es...
-
granted patents on two
forms of
bifocals which become commercially standardized as the "cemented" and "perfection"
bifocals. Both had the
serious faults...
- to
adjust them for
desired distance or prescription, or both.
Current bifocals and
progressive lenses are static, in that the user has to
change their...
- Gl****es
prescribed to
correct presbyopia may be
simple reading gl****es,
bifocals, trifocals, or
progressive lenses.
People over 40 are at risk for developing...
- current. His
numerous important inventions include the
lightning rod,
bifocals, gl****
harmonica and the
Franklin stove. He
founded many
civic organizations...
-
archaeologist André Marek; and his son Chris,
discover a lens from Johnston's
bifocals and a note
begging for help,
although both date over 600
years old. When...
-
viewpoint of the heroine, and
opens with a
comment on
Johnson Johnson's
bifocals. Source: In this series, the date of
publication is not the same as the...
