Optician ABO Exam Questions & Answers 2026 (21–30)

Question 1

Increasing pantoscopic tilt effectively moves the optical center in which direction relative to the pupil?

TheoryPractice · Accepted Answer

Downward (away from pupil, requiring the OC to be raised to compensate). Each degree of pantoscopic tilt moves the effective optical center approximately 0.5 mm downward from the pupil center. To maintain proper optical alignment, the OC should be positioned higher to compensate for the tilt.

Question 2

A frame has 10 degrees of pantoscopic tilt. Using the 0.5 mm per degree rule, how far below the pupil center should the optical center be placed to be optically equivalent to a zero-tilt fit?

TheoryPractice · Accepted Answer

5 mm below. At 0.5 mm per degree: 10° × 0.5 = 5 mm. The OC should be placed 5 mm below the pupil center when 10° of pantoscopic tilt is used, to maintain correct effective optical positioning.

Question 3

If a metal frame temple is pressing uncomfortably on the top of the ear, the optician should:

TheoryPractice · Accepted Answer

Move the bend point further back (toward the temple tip). Pressure on the top of the ear means the temple is bending too early. Moving the bend point posteriorly (further toward the tip) eliminates the pressure point on the ear.

Question 4

To increase the pantoscopic tilt of a metal frame, the optician should:

TheoryPractice · Accepted Answer

Angle the endpiece or frame front downward at the bottom. Pantoscopic tilt is increased by pushing the bottom of the frame front closer to the face, typically by adjusting the endpiece or bending the frame front downward at the bottom rim.

Question 5

A patient's frame sits higher on the left side than the right when viewed from the front. Which adjustment corrects this?

TheoryPractice · Accepted Answer

Bend the temple on the higher side downward at the bend point. If the left side sits high, the left temple is bending the frame up. Adjusting the bend on the higher-side temple to angle it downward will level the frame.

Question 6

When adjusting nose pads to correct a frame that sits too close to the face (too short vertex distance), the optician should:

TheoryPractice · Accepted Answer

Move the pads farther apart (outward). Moving the nose pads outward (away from the center) pushes the frame away from the face, increasing vertex distance. Bringing pads together has the opposite effect.

Question 7

A patient reports the frame is loose laterally and the lenses are not centered on the pupils. The temples appear to splay out. The BEST first adjustment is:

TheoryPractice · Accepted Answer

Reduce the temple spread by bending the temples inward. Lateral looseness with splayed temples indicates excessive temple spread. Reducing the spread (bending temples inward at the hinge area) pulls the frame back onto the face and re-centers the lenses over the pupils.

Question 8

After heating and reshaping an Optyl frame, it does not hold the new adjustment. What is the most likely cause?

TheoryPractice · Accepted Answer

Optyl was reheated after adjustment, reverting to its original shape. Optyl's epoxy shape-memory means reheating causes it to return to the factory-molded shape. If the frame was reheated after adjustment (e.g., to seat nose pads), the adjustment is lost. Always complete all heating steps before final adjustment.

Question 9

For a high minus prescription, the optician should generally recommend a frame with:

TheoryPractice · Accepted Answer

Small eye size to minimize lens thickness and weight. High minus lenses are thicker at the edges. A smaller eye size reduces the edge thickness, improving cosmesis and reducing weight. This is a fundamental frame selection principle for minus Rx.

Question 10

For a high plus prescription, the optician should recommend a frame that is:

TheoryPractice · Accepted Answer

Small and positioned to minimize center thickness. Plus lenses are thickest in the center. A small frame reduces center thickness and weight. Rimless designs are generally avoided for high plus because the thick lens edge may crack at drill points.

Optician ABO Exam Questions & Answers 2026 (21–30)

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