Opterio Questions

Which ocular structure is the primary source of oxygen for the cornea when the eye is closed?

A Tear film

B Aqueous humor

C Bulbar conjunctival vessels

D Palpebral conjunctival vessels

D Palpebral conjunctival vessels

Patients should be instructed to insert their contact lenses ______ applying makeup to minimize contamination

1. It does not matter

2. After

3. During

4. Before

4. Before

Compared to wearing spectacles, a hyperopic patient wearing contact lenses will have an accommodative demand for near objects is:

1. Lower

2. Higher

3. The Same

4. Zero

1. Lower

Assessment of the lid wiper area (the mucutaneous junction of the upper lid margin) with fluorescein or lissamine green is important to detect:

1. Blepharitis

2. Lid Wiper Epitheliopathy (LWE), indicating increased friction

3. Meibomian gland dysfunction

4. Ptosis

2. Lid Wiper Epitheliopathy (LWE), indicating increased friction

A presbyopic patient new to contact lenses may struggle with insertion primarily because they:

1. Have poor dexterity

2. Cannot see the near lens clearly without reading glasses

3. Have large pupils

4. Have dry eyes

2. Cannot see the near lens clearly without reading glasses

Presbyopic patients new to contact lenses often struggle with insertion and removal primarily because:

1. Their pupils are smaller

2. They produce fewer tears

3. They cannot see near objects (like the lens of their finger) clearly without their reading glasses

4. Their lids are tighter

3. They cannot see near objects (like the lens of their finger) clearly without their reading glasses

If a patient drops a daily disposable soft lens in the sink, they should:

1. Rinse it with tap water and insert

2. Throw it away and use a fresh one

3. Clean and disinfect it thoroughly with their care system before wearing

4. Rinse it with saline and insert

2. Throw it away and use a fresh one

Upon blinking, an optimally fitted soft contact lens in primary gaze should ideally move approximately:

1. 0.3 mm

2. 0.1 mm

3. 1.0 mm

4. 0.00 mm

1. 0.3 mm

An over-refraction of plano (0.00 D) with a trial lens of -4.25 D means the final contact lens power should be:

1. Needs retesting

2. -4.50 D

3. -4.00 D

4. -4.25 D

4. -4.25

To minimize the risk of biofilm formation, contact lens shortage cases should be replaced at least every:

1. Year

2. One to three months

3. Six months

4. Whenever the bottle runs out

2. One to three months

Convert +7.50 D at a vertex distance of 12 mm to corneal plane power. F_c= F_s/(1-dF_s)

1. +8.24 D

2. +7.00 D

3. +7.50 D

4. +6.90 D

1. +8.24

What is the equation for Vertex Distance to Corneal Plane Power?

Where F_c = Corneal Plane Power, F_s = Power in Diopters, & d = Vertex distance in meters (ex: vertex given = 12 mm d = 0.012 m)