Objective 4

Question 1

Low magnification on the slit lamp allows the examiner to highlight details of abnormalities in the anterior segment of the eye. True or False?

Answer 1

False (High magnification is used to see abnormalities of the anterior segment)

Question 2

One way to prevent “blinding” or “dazzling” the patient is to focus the beam near of at the limbus.
True or False?

Answer 2

True (Another method is to have the patient close their eyes before beginning.)

Question 3

Another method is to have the patient close their eyes before beginning, or place your hand in front of the light and narrow the slit to the narrowest beam.

Answer 3

True (This will help to prevent “dazzling”.)

Question 4

In order to check for the depth of a patient’s anterior chamber you focus the optic section of the slit lamp at the edge of the pupil.

Answer 4

False (The slit lamp must be focused at the edge of the cornea to observe anterior chamber depth.)

Question 5

The method for observing inflammation in the anterior chamber is to focus a conical beam using high magnification into the anterior chamber and watch for particles or cells floating in the fluid.

Answer 5

True (The presence of cells or flare indicates either a keratitis or a uveitis in which case a referral must be made.)

Question 6

A one-to-one ratio between the cornea’s optic section and the space between it and the lens is a sign of a wide anterior chamber angle.

Answer 6

True (The ratio between the two is referred to as a “grade” 1 through 4 with a ratio of 1:4 being extremely narrow.)

Question 7

Central corneal clouding may be observed with the naked eye after focusing the slit lamp beam on the central cornea using the sclerotic scatter method.

Answer 7

False (The slit beam must be focused at the edge of the cornea known as the limbus to observe central corneal clouding with the naked eye.)

Question 8

The normal value for a tear break-up test is 10 -15 seconds.

Answer 8

True (A patient with a break up time (B.U.T.) of less than ten seconds may be a poor candidate for contact lenses)

Question 9

Neovascularization is a sign of oxygen deprivation in a soft contact lens wearer that can be observed with the biomicroscope.

Answer 9

True (Encroachment of vessels into the cornea past the limbus 1 mm or more is an indication of hypoxia. The patient’s contact lenses should be closely inspected and evaluated when these conditions are observed.)

Question 10

A crystalline lens with cataract formation may appear cloudy and swollen or enlarged when observed with the slit lamp.

Answer 10

True (The crystalline lens may also appear yellowish or brown in color.)