Objective 1

Question 1

The words slit lamp and biomicroscope are often used interchangeably to identify one instrument. The slit lamp is the source of the light beam that can be widened or narrowed both horizontally and vertically as needed, while the biomicroscope is the binocular microscope that has its focus set at the same place or plane as the slit lamp’s beam. This makes the two parts of the instrument parfocal.
True or False?

Answer 1

True

Question 2

Taking the slit beam out of ………….., separates the focal points of the two systems for some illuminations.

Answer 2

Click Stop

Question 3

On most models, the slit beam width controls allow the examiner to adjust the beam width from…….

Answer 3

0.1mm to 14mm

Question 4

The vertical height of a slit can be adjusted in order to focus on …..

Answer 4

a small, specific part of the eye.

Question 5

The circle can be made very small if desired, especially for the conic section. This helps the examiner see….

Answer 5

aqueous flare

Question 6

Low magnification is for

Answer 6

general observations

Question 7

Medium Magnification is for

Answer 7

Structures

Question 8

High magnification is for

Answer 8

detail magnification

Question 9

The cobalt-blue filter is used for

Answer 9

fluorescein testing

Question 10

The red free filter is used for

Answer 10

viewing blood vessels and contact lenses, but its primary use is for fundus observations with a 70D lens.

Question 11

The heat-absorbing filter is used for

Answer 11

diffuse illumination to increase patient comfort

Question 12

the polarizing filter is to

Answer 12

reduce glare on a 70D lens and for cataract detection.

Question 13

There are click-stop settings that provide the examiner with a

Answer 13

reference point from which to start an exam

Question 14

The points at which the scope and the lamp both aim in the same direction is called

Answer 14

in click-stop

Question 15

Any point where the lamp and scope aim at different spots is called

Answer 15

out of click-stop.

Question 16

Used for moving the scope and the beam together laterally to observe different areas of the eye. It is moved forward and backward for focusing

Answer 16

Joy-stick

Question 17

This part of the assembly can be moved up and down to center the patient’s eyes with the scope.

Answer 17

Chin rest

Question 18

This helps the patient’s head to be held steady. This is crucial especially for high magnification, with its inherently poor depth of focus and intensity of the light

Answer 18

Head rest

Question 19

These controls are knobs or levers that vary with different instruments.

Answer 19

Slit Width & Height Controls

Question 20

These controls are levers or click dials, and some are zooms such as those seen on video cameras. A zoom control is a smooth increase in magnification as opposed to the abrupt 6X to 40X of the lever or click dial type devices.

Answer 20

magnification controls

Question 21

This is a metal rod, which is placed in the hole at the base of the front of the assembly. It is used to help the examiner make sure the slit and the scope are focused at the same distance, or parfocal. It is then removed. Periodic checks of the binocular focus should be done.

Answer 21

Focusing Rod