Advantages of the Loop
This type of ptosis prop, when correctly made and fitted, has many advantages over adhesive tape of the rigid props offered by some opticians.
1. It is comfortable because it is soft and flexible, exerting only light upward pressure on the led with no pressure at all on the eyeball. It locks itself securely into the eye socket, giving the wearer confidence to take part in normal activities.
2. Its flexibility permits a degree of natural "blink" to clear the eye of tears. This is not possible with the eye taped permanently open. A quick up-and-down waggle of the specs will usually give relief.
3. It is safe because it has no sharp projections to insure the eye.
4. The design is unobtrusive even when worn with rimless or clear-framed glasses, if the loop is carefully positioned to lie within the outline of the frame.
5. It is cheap and easy to manufacture and does not entail meticulous fitting to the wearer. It can be adapted to suit almost any style of spectacle frame, although plastic frames with a minimum of 3mm at the brow-line are most suitable. Loops can be fitted to metal frames by soldering small bosses to hold them but this is more expensive.