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14
Brow Rest
Focussing
and Axis
Control
5. Instrument heads - Retinoscopes
Professional Combi Retinoscope
Focussing and axis control (Streak)
The vergence is altered by sliding the focussing control up and
down as indicated. In the top position the effect is a concave
mirror. Mid position produces a streak behind the patient. The
mid position is used to determine the presence and axis of any
astigmatism. In the bottom position the effect is a divergent
plane mirror effect. Refraction is normally performed between
the mid position and the bottom position. The focussing and
axis control can be rotated continuously in any direction.
Focussing and axis control (Spot)
The vergence is altered by sliding the focussing control up and
down as indicated. For all positions the effect is a plane mirror
effect.
Brow Rest
The Keeler retinoscope is supplied with a choice of brow rests to
accommodate spectacle wearers. To interchange the brow rest
disconnect and attach as indicated.
Aperture Control
The aperture control has two positions. To change from the
large to the small aperture slide the control from left to right as
indicated.
Note: Handheld diagnostic instruments can become hot
during use and charging.
Aperture
Control
