Multiposition Spectacle Telescopic System.

Spectacle mounted telescopic aids have been proven very useful in expanding residual sight for many low vision patients. While primarily designed for improving distance vision, their application for near use is possible with the use of a reading cap or a telescope with an adjustable focus design. Since these telescopes have a dual purpose, their position in the spectacle mount is very important. If mounted in the bioptic position for distance use,
their use for reading tasks require that the patient tilt their head in such a position that is uncomfortable for prolonged reading. If the telescope is mounted in the reading position, distance use becomes impractical. When mounted in the central position, there is a compromise for both distance and near use, as well as an obstructed field of view with subsequent impaired mobility. The goal of this project was to design a system in which a spectacle mounted telescope could have the capability to be adjusted to different positions for both distance and near use. This design would consider such factors as materials
to be used, feasibility of manufacture, durability, cost, and simplicity of use.