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NCLE Adv. Practice 2
NCLE advanced exams practice questions PART 2
| Question | Answer |
|---|---|
| The sagittal depth of a rigid gas permeable contact lens can be altered without changing the diameter by | Changing the radius of curvature of the posterior optical zone |
| A truncation is used on a rigid gas permeable contact lens t help enhance the performance of which type of design? | Bifocal |
| The mass of an aphakic rigid gas permeable contact lens can be reduced by making the lens design | Lenticular |
| In order to tighten the fit of a rigid gas permeable lens, you can | Increase the optical zone diameter, Increase the overall lens diameter |
| A high minus rigid gas permeable lens will be thin centrally with relatively thick edges. To reduce the edge thickness, and increase overall comfort, use | A hyperflange |
| Tp add minus power to a rigid contact lens with a rotating modifying spindle, one would | Polish the central anterior surface |
| What lens design would provide the best visual acuity for a patient with the following information? K's 42.00 @ 180 / 42.50 @ 90 Rx -6.75 +1.75 x 90 | Front surface toric rigid gas permeable |
| Which of the following describes the angle that the edge of a bead of water makes with the surface of a plastic? | Wetting angle |
| If a patient has 1.50 D of refractive cylinder and keratometer readings of 44.00 @ 180 / 44.50 @ 90, a spherical rigid gas permeable lens will | Usually result in residual astigmatism |
| If a patient has spherical K readings of 43. 50 and an Rx of -4.00 +1.75 x 90, the patient has | Lenticular astigmatism |
| In which of the following situations is a rigid gas permeable lens always preferred over a soft lens? | Irregular astigmatism |
| In order to steepen the base curve of a rigid gas permeable lens without changing the lens cornea relationship, you would also need to | Decrease the optical zone diameter |
| To steepen the lens to cornea relationship of a rigid gas permeable lens you could | Increase overall diameter and increase optical zone diameter |
| Which is not an indication for modifying a rigid gas permeable lens? | Surface Wettability |
| Which of the following modifications can be made to a rigid gas permeable lens in the office? | Changing the base curve |
| To achieve a lens to cornea relationship that exhibits apical clearance, the lens is designed steeper than the flattest corneal measurement. This lens will most often position: | Centrally |
| Which of the following are visual systems used by rigid gas permeable bifocal lenses? | Simultaneous and alternating |
| Which of the following are methods for stabilizing the rotation of rigid bifocal contact lenses? | Truncation and prism ballast |
| To decrease the sagittal depth of a rigid gas permeable contact lens you can | Flatten the base curve, Decrease the overall diameter |
| Dimple veil staining on the cornea is caused by | Air bubbles trapped under a rigid lens |
| The GP multifocal design that relies on the use of a variablerate of curvature across the lens surface to achieve a change inpower is known as | Translating |
| To allow for proper corneal oxygenation when fitting rigid gas permeable lenses, which of the following material characteristics must be considered? | Dk/t |
| Given the following information: |
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