Contact Lens midterm 1

Given the following SRx, which soft toric lens do you order for your patient?

OD: -1.00 -1.00 x 180

OS: -0.75 -1.25 x 178

• a. -1.00 -1.00 x 180 / -0.75 -1.25 x 180

• b. -1.25 -0.75 x 180 / -0.75 -1.25 x 180

• c. -1.25 -1.00 x180 / -1.00 -1.00 x 180

• d. -1.25 -1.25 x180 / -1.00 -1.00 x 180

What is the ideal MOB when assessing a soft contact lens in primary gaze?

• a. 1 mm

• b. 1.5 mm

• c. No movement

• d. 0.1 mm

If a soft contact lens is too steep, which of the following complications are most anticipated?

• a. Dryness

• b. Fluctuating vision

• c. Foreign body sensation

• d. Decentration

Which of the following are false regarding SiHi lenses?

• a. Less likely to have corneal edema

• b. More likely to see accumulation of epithelial debris

• c. Increasing silicone content will increase the Dk

• d. More likely to have protein deposits

Pick the correctly matched pair in regards to scleral lens fitting:

• Impingement: outer landing zone

• Compression

  Outer landing zone

• Edge lift

  Steep scleral landing zone

• Corneal warpage

  Excessive apical clearance

Select the appropriate way to remove a scleral lens from a patient's eye.

• Use big DMV plunger and suction inferior (6:00)

• Use small DMV plunger and suction inferior (6:00)

• Use big DMV plunger and suction superior (12:00)

• Use small DMV plunger and suction superior (12:00)

You determine that your SCL patient enjoys the comfort of their new lenses. Vision in office through contacts is 20/15 OD and OS, and the SOR is -0.50 DS. What do you do next? Select two.

• a. Finalize new contact lens prescription with additional -0.50 DS.

• b. Instill NaFI and check for staining.

• c. Maintain current contact lens prescription and finalize today.

• d. Select trials with additional -0.50 DS and have patient RTC in 1 week to re-evaluate.

What is the correct setup when evaluating MOB?

• 1. 16x, optic section @ 45 degrees

• 1. 16x, parallelepiped @ 45 degrees

• 1. 10x, optic section @ 30 degrees

• 16x, parallelepiped @ 0 degrees

Which of the following statements is false (select all that apply)

• a. Sleeping in extended wear soft contact lenses is permitted

• b. Corneal astigmatism is fully corrected with soft contact lenses

• c. An Rx -9.00 DS is not ideal for SCL wear

• d. SCL BC values are consistent among different manufacturers

Which of the following SCL parameters are non-customizable?

• a. OZD

• b. OAD

• c. Center thickness

• d. All of the following are non-customizable