The document outlines various types of specialized spectacles, including clip-ons, monocles, ptosis spectacles, and more, each designed for specific visual needs or conditions. It describes the functionality, advantages, and disadvantages of each type, such as recumbent spectacles for lying patients and athletic spectacles for sports. Additionally, it includes unique designs like lorgnette and prince nez spectacles, highlighting both functional and fashion aspects.

1. Special Purpose Frame
Salal Khan
M.Optom, FAAO (USA), DSM (FIFA)

2. 1. Clip-ons
• Clip-ons are supplementary lenses in a mounting that fastens to the
frame front of a conventional pair of spectacles.
• They fit on the outside of the front and may contain sun lenses, plus
lenses for reading, prisms, or any other prescription desired for
testing or visual training purposes.
• Fit outside of the frame.

4. 2. Monocle
• A monocle is a single lens mounting held in place by being wedged
between the cheek and upper eyebrow area.

5. 3. Ptosis Spectacles
• Ptosis spectacles are equipped with a crutch that is positioned behind
and roughly parallel to the upper eyewear.
• The crutch supports the skin of the upper lid and prevents the lid
from drooping closed.

6. 4. Recumbent Spectacles
• Recumbent spectacles are equipped with reflecting prisms that
enable a person lying flat on his or her back to see straight ahead
while looking straight up.
• These can be useful for those wishing to read while being required to
remain on their backs for long periods of time.

7. Advantage
• Help people to read in supine
position
• Useful for bed ridden patient
Disadvantage
• It is heavy and thus not
comfortable

10. 5. Drop-ins
• Drop-in contains a cell where the lens may be dropped in and added
behind the lenses of a conventional pair of spectacle.
• Cosmetically not well accepted.
• It’s like a trial frame.

11. 6. Folding Frames
• Folding frames are those with hinges placed at the bridge and halfway
down each temple.
• Such frames are popular for reading glasses and are often seen with
over-the-counter readers

12. 7. Hemianopic Spectacle
• Used as field expanders in low vision patients.
• Has prism on one side with the base of the prism towards the blind
side
• Hemianopic spectacles are used by those with a homonymous
hemianopia, which is a loss of vision on one side of the midline of the
visual field.

13. 8. Athletic Spectacles
• For sports people
• They have sturdy(Nylon)plastic frames with thick soft silicone padding
around the bridge and temple to protect the wearer when playing
sports
• They come with an elastic headband, fitted with polycarbonate lenses
• Eg. In playing basketball, table tennis etc.

15. 9. Lorgnette Spectacle
• These are spectacles frames mounted on a handle,rather than having
sides.
• When the person wants to see something, he/she holds the lorgnette
up to the eyes.
• Functional item and fashion accessory.

17. 10. Makeup Spectacle
• Makeup spectacle has 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

18. 11. Entropion Spectacle
• Entropion spectacles are equipped with an additional
extension behind and parallel to the lower eyewire, which is
known as a crutch or gallery.
• The crutch supports the skin of lower lid and prevents the
lower lashes from turning in on the eye itself.

19. 12. Reversible spectacles
• These are only for an individual using only one and needing
different corrective lenses for distance and near.
• The distance in fitted into one ring and near prescription on the
other.
• Two main metal type of reversible spectacles. Are those having
nut-crutch joints and those having reversible sides.

20. 13. Prince Nez Spectacles
• Prince nez frames are a style of eyeglasses that were
popular in the late 19th and early 20th centuries.
• The term ‘prince nez’ is French and translates to ‘pinch
nose’ in English, which refers to the way these glasses are
held in place.

21. THANK YOU!