This document discusses different types of special purpose frames. It describes frames that hold supplementary lenses outside the main frame, frames that contain cells to hold additional lenses behind the prescription, and folding frames with hinges at the bridge and temples to reduce the frame size. It also covers frames with extensions to support the lower eyelid, trial frames without temples, monocular frames that allow viewing through one lens at a time, and frames with flip-down lenses for reading or sunglasses.

1. SPECIAL
PURPOSE
FRAMES
Fakhruddin S. Barodawala M. Optom,
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2. • Supplementary lens in a mounting that fasten to the
frame front
• Fit outside of the frame
• Sunglasses or Prisms
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3. • Contains a cell where the lens may be dropped in and
added behind the prescription
• Cosmetically not well accepted
• Similar to trial frames
• Not stable
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4. • Has hinge placed at the bridge and half way the temple
• Enables the spectacle to fold to about ½ of its size
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5. • Equipped with additional extension behind and parallel to
the lower eye wire
• Also known as “crutch” glasses
• Supports the lower lid and prevents the lashes to touch to
the cornea,

6. • Specially designed frame fronts
• Absence of temple , instead a clip or a stick present
which helps to be held in the front of the eye
• Used in optical stores to show difference between two
lenses
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7. • Has a crutch positioned at the upper rim of the frame
front
• The crutch prevents the lid to droop down giving it
support

8. • Has refracting prisms incorporated to see straight while
looking down
• Useful for reading while sleeping
• Useful for bed ridden patients
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9. • Used as field expanders
• Has prism on one side with the base towards to the blind
side
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10. • Has 2 frame fronts
• One is fixed
• Another is flipped down when required
• Usually has the near add or sunglasses

11. • Independent rims that
are hinged to the part of
the frame
• Each lens is alone
• 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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