From Adaptive Optics for Vision Science
10.3.6 Raster Scanning
Two mirrors are generally used to scan the focused spot in a raster pattern
on the retina. One mirror scans the line, defining the line rate, and the other
scans vertically, to set the frame rate. For the line scanner, an SLO can
use a polygon scanner or a galvanometric scanner. The ratio of the line scan
frequency to the vertical scan frequency defines the number of lines per
Two important considerations in the optical system are the beam size and
the scan angle at the location of the eye. As described in an earlier section,
the pupil size at any conjugate plane is easily computed by multiplying the
size of one pupil by the product of the magnifications of the telescopes that
lie between the two planes. The opposite occurs with field angle, since, as the
beam size is reduced, the scan angle enlarges. This is an invariant in the
optical system and is governed by the following equations:
where ma..z is the product of the magnifications of the telescopes between the
conjugate planes, a and z.
These considerations bear on the selection of the scanner. For example, if
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