BiOptic Driving Network - Fitting a BiOptic
Magnification and location of the
BiOptic telescope must be prescribed carefully to ensure its successful use. Determination of the appropriate magnification often entails a goal of having the patient see 20/40 (6/12) or better through the telescope.
The horizontal and vertical placement of the
BiOptic telescope, as well as its mounting angle (MA), should be carefully determined. The horizontal location of the
BiOptic telescope will coincide with the monocular
inter-pupillary distance (IPD) appropriate for the working distance. The monocular IPD may be measured with a
pupillometer, ruler, or other technique and then refined through the use of
BiOptic fitting apertures
(BFA). BFA's are opaque black rings printed on static cling vinyl, making it possible to place the aperture anywhere on a lens and easily moved. The vertical position of the telescope depends on its proposed use. It is generally placed high in the lens for tasks such as driving, in primary gaze for computer use and low for near use. BFA's may be used to determine and/or refine the vertical placement of the telescope.
For distance, the BiOptic telescope is usually mounted centrally or high in the lens
- Usually as high in the lens as possible, especially for driving or if near tasks will also be performed while wearing a distance BiOptic
- 3mm between the edge of the telescope and frame must remain for lens structural strength.
For distance the telescope is placed at the monocular distance inter-pupillary distance (IPD)
BiOptic Fitting Apertures
See Determining Location and Mounting Angle with BiOptic Fitting Apertures by Dr. Robert B Greer, University of California, Berkeley. (Microsoft PowerPoint, 1.4 Mb)
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