2. โข Supplementary lens in a mounting that fasten to the
frame front
โข Fit outside of the frame
โข Sunglasses or Prisms
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3. โข Contains a cell where the lens may be dropped in and
added behind the prescription
โข Cosmetically not well accepted
โข Similar to trial frames
โข Not stable
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4. โข Has hinge placed at the bridge and half way the temple
โข Enables the spectacle to fold to about ยฝ of its size
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5. โข Equipped with additional extension behind and parallel to
the lower eye wire
โข Also known as โcrutchโ glasses
โข Supports the lower lid and prevents the lashes to touch to
the cornea,
6. โข Specially designed frame fronts
โข Absence of temple , instead a clip or a stick present
which helps to be held in the front of the eye
โข Used in optical stores to show difference between two
lenses
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7. โข Has a crutch positioned at the upper rim of the frame
front
โข The crutch prevents the lid to droop down giving it
support
8. โข Has refracting prisms incorporated to see straight while
looking down
โข Useful for reading while sleeping
โข Useful for bed ridden patients
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9. โข Used as field expanders
โข Has prism on one side with the base towards to the blind
side
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10. โข Has 2 frame fronts
โข One is fixed
โข Another is flipped down when required
โข Usually has the near add or sunglasses
11. โข Independent rims that
are hinged to the part of
the frame
โข Each lens is alone
โข Right lens is tipped
down or sideways,
makeup may be applied
to the right eye while
viewing from the left eye
and vice versa
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