Contact Lens Fitting Assessment

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What is a characteristic of a bad contact lens fit?

Lens movement on blink

Stable sagittal depth

Immobility and associated inflammation (correct)

Comfortable vision

Why is the selection of BOZR considered pot-luck?

Because it depends on the settling time

Because it depends on the material used

Because it depends on the diameter of the lens

Because it depends on the sagittal depth of the lens (correct)

What happens to the lens during the initial 5 minutes of settling?

It remains unchanged

It becomes looser

It settles to its optimal position (correct)

It becomes tighter

What is the result of natural loss of excess tears during lens fitting?

A more accurate evaluation of the lens fit Signup and view all the answers

What is the effect of temperature rise on the lens during settling?

Slight effect Signup and view all the answers

What happens if the lens has not settled during evaluation?

It looks looser than it actually is Signup and view all the answers

What is the critical dimension of the lens?

Sagittal depth Signup and view all the answers

What is the result of a larger lens overlapping onto the sclera?

Less movement of the lens Signup and view all the answers

What is the typical movement of the lens on blink?

0.3-5 mm Signup and view all the answers

What is the result of vertical lens sag?

The lens crosses the limbus Signup and view all the answers

What is the primary purpose of the PUSH-UP test in assessing the fit of a contact lens?

To measure the force needed to move the lens Signup and view all the answers

What is the significance of a lens moving 0.25mm – 0.50mm in the Bo Movement scale?

It is a normal range of movement Signup and view all the answers

What is the recommended minimum movement of a lens for extended wear?

0.5mm Signup and view all the answers

What is the primary advantage of made-to-order lenses?

They can be altered to fit the patient's needs Signup and view all the answers

What is the purpose of the Wolffsohn scale in assessing the fit of a contact lens?

To grade the lens fit using a 3-point scale Signup and view all the answers

What is the significance of a scleral centration overlap of > 0.5 -1.0mm between nasal and temporal lag?

It indicates a tight lens fit Signup and view all the answers

What is the recommended approach to adjusting the fit of a soft contact lens?

Change the diameter of the lens first Signup and view all the answers

What is the primary concern with fitting soft torics?

Ensuring the Cyl axis is accurately corrected Signup and view all the answers

What is the CAAS/LARS rule used for in fitting soft torics?

To compensate for lens rotation Signup and view all the answers

What should you expect to see when inserting a compensated axis in a soft toric lens that has rotated?

The lens should still appear rotated on the eye Signup and view all the answers

What is the primary purpose of conducting a slit lamp examination in contact lens fitting?

To assess the lens fit and visual acuity Signup and view all the answers

What is the effect of a larger lens diameter on the movement of the lens?

It decreases the movement of the lens Signup and view all the answers

What is the significance of the sagittal depth of the lens?

It is the critical dimension of the lens Signup and view all the answers

What is the recommended initial settling time for a contact lens?

5 minutes Signup and view all the answers

What is the purpose of over-refraction in contact lens fitting?

To check the spherical power of the lens Signup and view all the answers

What is the result of an immobile contact lens fit?

It is associated with inflammation and microbial keratitis Signup and view all the answers

What is the purpose of the Duochrome assessment in contact lens fitting?

To check the spherical power of the lens Signup and view all the answers

What is required to properly evaluate the fit of a contact lens?

Natural loss of excess tears Signup and view all the answers

What is the characteristic of a well-fitting contact lens?

It has a good centration and complete corneal coverage Signup and view all the answers

What is the purpose of recording the fit of a contact lens?

To check the centration and corneal coverage of the lens Signup and view all the answers

What is the primary concern with a soft immobile lens?

It will cause problems with comfort Signup and view all the answers

What is the significance of a scleral centration overlap of < 0.5 -1.0mm between nasal and temporal lag?

The lens is slightly loose Signup and view all the answers

What is the effect of friction on lens movement?

It decreases the movement of the lens Signup and view all the answers

What is the typical approach to adjusting the fit of a soft contact lens?

Diameter changes are more effective than radius changes Signup and view all the answers

Contact Lens Fitting Assessment

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Questions and Answers

What is a characteristic of a bad contact lens fit?

Why is the selection of BOZR considered pot-luck?

What happens to the lens during the initial 5 minutes of settling?

What is the result of natural loss of excess tears during lens fitting?

What is the effect of temperature rise on the lens during settling?

What happens if the lens has not settled during evaluation?

What is the critical dimension of the lens?

What is the result of a larger lens overlapping onto the sclera?

What is the typical movement of the lens on blink?

What is the result of vertical lens sag?

What is the primary purpose of the PUSH-UP test in assessing the fit of a contact lens?

What is the significance of a lens moving 0.25mm – 0.50mm in the Bo Movement scale?

What is the recommended minimum movement of a lens for extended wear?

What is the primary advantage of made-to-order lenses?

What is the purpose of the Wolffsohn scale in assessing the fit of a contact lens?

What is the significance of a scleral centration overlap of > 0.5 -1.0mm between nasal and temporal lag?

What is the recommended approach to adjusting the fit of a soft contact lens?

What is the primary concern with fitting soft torics?

What is the CAAS/LARS rule used for in fitting soft torics?

What should you expect to see when inserting a compensated axis in a soft toric lens that has rotated?

What is the primary purpose of conducting a slit lamp examination in contact lens fitting?

What is the effect of a larger lens diameter on the movement of the lens?

What is the significance of the sagittal depth of the lens?

What is the recommended initial settling time for a contact lens?

What is the purpose of over-refraction in contact lens fitting?

What is the result of an immobile contact lens fit?

What is the purpose of the Duochrome assessment in contact lens fitting?

What is required to properly evaluate the fit of a contact lens?

What is the characteristic of a well-fitting contact lens?

What is the purpose of recording the fit of a contact lens?

What is the primary concern with a soft immobile lens?

What is the significance of a scleral centration overlap of < 0.5 -1.0mm between nasal and temporal lag?

What is the effect of friction on lens movement?

What is the typical approach to adjusting the fit of a soft contact lens?

What is the significance of a lens moving > 0.25 mm – 0.50 mm in the Bo Movement scale?

What is the purpose of assessing the fit of a lens after several hours of wear?

What is the significance of a keratometer mires stable on blink?

What is the primary advantage of using a better wetting lens?

What is the significance of a lens that requires removal in an emergency?

What is the primary concern with fitting soft torics?

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