User's Manual Part 5

8065751131 6.15

8. Remove the LIO-AT and look at the scale on the eyepieces to insure that the pupil

distance is symmetrical. If not, center the headset and readjust the eyepieces. Correct

adjustment of the optics is particularly important when examining small pupils.

Once set, changing the adjustments is required only if another examiner uses the instrument.

Controls for Observation and Illumination

The Aperture Lever (see Figure 6-12) allows you to choose between two different-sized

illumination ﬁ elds. The choice of illumination ﬁ eld size depends mainly on the size of the

patient’s pupil (the small illumination ﬁ eld is the recommended setting). The positions of the

Aperture Lever for large and small illumination ﬁ elds are marked with large and small black

dots, respectively.

The Convergence Control Knob provides synchronized adjustment of both examination and

illumination beams to suit the patient's pupil size. Wide convergence and parallax selection

allows for maximum stereopsis with large pupils. Narrow convergence and parallax selection

allows stereoscopic examination for small pupils.

NOTE: Use the small pupil setting and

narrowest convergence angle at the small illumination ﬁ eld size setting; otherwise,

clipping (shadow) of the illumination ﬁ eld will occur. The Convergence Control Knob

adjustment range is limited in the LIO-AT to 50% of the original

Heine

range to

accommodate for the laser beam delivery requirements.

The Delivery Mirror Control Knob can be rotated to move both the illumination beam and the

laser beam in the vertical plane.

CAUTION

Do not use the LIO-AT with the illumination power supply set at maximum intensity

for

more than 10 continuous minutes. The LIO-AT must be allowed to cool down at

least 20

minutes between uses. Use as little observation/illumination light as possible and

always switch power supply OFF after use.

Circumference

Adjustment Knob

(on backside of band)

Observation Optics

Adjustment Knob

Laser Vertical

Adjustment Knob

Delivery Mirror

Control Knob

Height Adjustment Knob

Aperture Lever

Laser Spot Size Lever

Convergence Control Knob

Figure 6-12 LIO-AT Controls and Adjustments