Quiz For Contact Lens Instrumentation

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The keratometer measures an area of the front surface of the cornea of approximately

Diopters to mm conversion cam be accomplished___________

The following formula can be used to calculate the power in diopters when the radius of curvature is known:

The following formula can be used to calculate the radius of curvature when the power in diopters is known:

The keratometer eyepiece ____________

When orienting the keratometer, the instrument body should be rotated to allow the axial scale to read exactly_____________at the axis marks

Once the keratometer and the patient have been properly oriented, the patient sees:

When focusing the keratometer, the operator will see:

Focusing a Keratometer:

The axis of a cylinder can be found when:

To measure the corneal surface power in the horizontal principal meridian

When measuring an astigmatic cornea

The range of curvatures in diopters the keratometer is capable of measuring without applying an auxiliary lenses is:

To obtain a keratometer reading in a high diopter range, fron 52.00 D to 61.00 D place a ______________ test lens sphere over the central aperture of the Keratometer mire.

To obtain a keratometer reading in the lower diopter range, from 30.00 D to 42.00 D place a ____________test lens sphere over the central aperture of the Keratom eter mire.

Referring to the “High Power” ( +1.25 table) on page 9, what is the corneal power in diopters when the drum reading is 45.50?

Referring to the “Low Power” ( -1.00 table) on page 9, what is the corneal power in diopters when the drum reading is 40.00?

A keratometer can also be used to measure the _______________of contact lenses.

When recording keratometer readings:

The slit lamp is also referred to as

The microscope on the slit lamp has various settings. Most instruments have magnification abilities ranging from:

When using a slit lamp, the majority of the microscopic eye exam is done:

In______________illumination light is spread evenly over the entire observed surface.

In______________illumination light is directed at a specific object and is especially useful in determining the depth of abnormalities.

In______________illumination light abnormalities are not illuminated by shining the slit beam directly on them, rather they are lit up by light that is reflected off an uninvolved area.

When using a slit lamp to evaluate a contact lens fit, redness at the corneal/limbal junction for 360 degrees may indicate:

When using a slit lamp to evaluate a contact lens fit, a lens which drops more than 1.0 mm when the patient looks up may indicate:

When using a slit lamp to evaluate a contact lens fit, generalized corneal edema and neovascularization may indicate:

When evaluating a rigid contact lens fit with fluorescein and a slit lamp, a thin film of dye spread under the entire lens with slight pooling at the periphery indicates:

When evaluating a rigid contact lens fit with fluorescein and a slit lamp, a band of dye running horizontally or vertically indicates:

This course has expired. Do not complete quiz.

This course has expired. Do not complete quiz.