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newSchoolWorks.com › VoTechWorks › Health & Personal Services › Optician / Optical Technician › Frame Fitting › Lesson 8
HLT-OPTI68-04 · Lesson 8 · 17 clock hours · lab

Metal Frame and Nose-Pad Adjustments

Objective. Students will adjust metal frames using the correct hand tools to achieve proper nose-pad alignment, bridge fit, and temple tension without scratching, fatiguing, or otherwise damaging the frame.

⚠ Pending professional review

This lesson, its worked examples and its practice questions has not yet been verified by a licensed clinician in the field or by a certification or approval body. It is a study draft and may contain errors. Do not use it to make decisions about any patient or medication. Always follow your instructor, your supervising professional, and current official references and regulations.

VoTechWorks program approval and accreditation are still in progress. Credentials are issued only by the certifying bodies named in each program, after their own exams.

Why Metal Frame Adjustments Matter

A well-fitted metal frame keeps lenses centered in front of the pupils, distributes weight evenly across the nose, and rests the temples against the head without pressure points. When any of these elements is off, the patient experiences discomfort, the optical centers shift away from the pupils, and visual performance suffers. As an optician, precise bench adjustment is one of your most important hands-on skills — and it must be done without damaging the frame finish or fatiguing the metal.

Know Your Metal Before You Touch It

Metal frames are not all the same, and the material dictates your approach.

Standard metal alloys (monel, nickel-silver, stainless steel) accept controlled bending with the appropriate pliers. Apply smooth, steady pressure and avoid sharp angles.

Zyl-coated metal has a thermoplastic coating over a metal core. The coating can crack if you apply pliers directly to it. Protect the surface by working at the uncoated adjustment points — the pad arms and temple joints — or by using jaw-protecting plier covers.

Titanium is lightweight, corrosion-resistant, and strong, but it work-hardens quickly. Make small, deliberate movements. Repeated back-and-forth bending in the same spot can cause titanium to snap without warning. Use titanium-safe pliers and keep adjustments minimal.

Memory metal (beta-titanium and similar alloys) is designed to flex and return to its original shape. Minor pantoscopic tilt corrections at the hinge may be possible, but significant reshaping — particularly of the frame front — exceeds what bench tools can reliably accomplish. For major adjustments on memory metal, the patient should be referred to the frame supplier or the frame may need replacement. Attempting to force memory metal with standard pliers risks sudden breakage and patient injury.

The Three Core Pliers and What They Do

Pad-arm pliers grip the pad arm close to its base and allow you to move the nose pad inward or outward (changing pad spread) and upward or downward (changing pad height). Always grip at the base, not at the pad itself. One jaw sits under the arm, the other on top; gentle rotation moves the arm in the desired direction.

Angling pliers (also called pad-angle pliers) rotate the pad around the long axis of the arm, changing the angle at which the pad face contacts the nasal tissue. Correct pad angle ensures full, even contact across the pad surface rather than a single-point pressure.

Frame-alignment (or frame-straightening) pliers have broad, smooth jaws for working on the bridge and frame front. They correct twist, level the eyewires, and adjust pantoscopic tilt at the endpiece area. Use them with a steady, controlled squeeze — never a twisting jerk.

Nose-Pad Adjustments

Pad spread is the horizontal distance between the two pads. Measure with a ruler at the pad face. Widening the spread moves the pads apart; narrowing brings them closer. Change spread by bending the pad arm at its base using pad-arm pliers — move each arm symmetrically when both sides need correction.

Pad height raises or lowers where the pad contacts the nose. A pad sitting too low allows the frame to ride down; one sitting too high pushes the frame up and may contact the inner corner of the eye.

Pad angle ensures the pad face lies flush against the nasal sidewall. Inspect from the front and from below. If only the top edge or bottom edge contacts the skin, use angling pliers to rotate the pad until full contact is achieved.

Bridge Fit and Pantoscopic Tilt

The bridge must distribute frame weight evenly across the nose without the frame sliding down or rocking side to side. Pantoscopic tilt is the angle (in degrees) at which the lens plane tips downward from vertical when viewed from the side. Standard pantoscopic tilt for most patients is approximately 8–12 degrees. If the frame front sits too vertical or tips back (retroscopic), increase pantoscopic tilt by gently bending the endpiece-to-temple junction downward with alignment pliers, or by adjusting the temple bend.

Measure tilt with a protractor or frame ruler against the lens plane. Record baseline and post-adjustment readings in your bench log every time.

Temple Tension and Skull Pressure

Temples should hug the side of the head with even, light tension — enough to keep the frame in place during normal head movement, not enough to create a pressure headache. Increase tension by very slightly decreasing the angle of the temple bend (bringing the tip closer to the skull). Decrease tension by opening the bend slightly. For metal temples, heat is generally not applied; use pliers at the bend point. Work gradually — small changes add up quickly.

Safety on the Bench

Recording Your Work

A bench log is not optional — it is a professional record. Write down the starting measurement, the target, the adjustment you made, and the final measurement. This protects both you and the patient, helps you track your own skill development, and supports quality assurance in any optical practice.

Key terms9

Pad spreadThe horizontal distance between the two nose pads, measured at the pad faces; adjusted by bending pad arms inward or outward.
Pad-arm pliersPliers designed to grip the nose-pad arm at its base, allowing the optician to change pad spread, pad height, and pad angle without damaging the pad or lens.
Angling pliersPliers that rotate the nose pad around the long axis of its arm to achieve full, even contact between the pad face and the patient's nasal tissue.
Pantoscopic tiltThe angle in degrees by which the bottom of the lens plane tips toward the cheek relative to vertical; typically 8–12 degrees in standard fitting.
Memory metalA frame alloy (often beta-titanium) engineered to flex and return to its original shape; major bench adjustments are not effective and may cause sudden breakage, requiring referral to the frame supplier.
Work hardeningThe process by which repeated bending makes a metal progressively stiffer and more brittle at the bend site, increasing the risk of fracture; especially significant with titanium.
Frame-alignment pliersBroad-jawed pliers used to correct twist and adjust the frame front, bridge, and pantoscopic tilt without leaving marks on the frame.
Temple tensionThe degree of pressure a temple exerts against the side of the head; corrected by adjusting the angle of the temple bend to increase or decrease contact force.
Bench logA written record of pre-adjustment measurements, intended targets, adjustments performed, and post-adjustment measurements; required for quality and traceability.

Worked examples4

1. The patient's frame has a pad spread of 32 mm. The fitting indicates the spread should be 34 mm. By how much must each pad arm be moved, and in which direction?
  1. Step 1 — Determine the total change needed: 34 mm − 32 mm = 2 mm wider overall.
  2. Step 2 — Because there are two pad arms and the adjustment should be symmetric, each arm must move outward by half the total change: 2 mm ÷ 2 = 1 mm per arm.
  3. Step 3 — Using pad-arm pliers at the base of each arm, bend each arm outward by 1 mm, then re-measure the spread to confirm the result is 34 mm ± 1 mm.
Answer: Each pad arm is moved outward 1 mm, for a combined increase of 2 mm, bringing total spread to 34 mm.
2. You measure the pantoscopic tilt of a metal frame and find it is 5°. The target is 8°. How many additional degrees of tilt are needed, and how do you verify the result?
  1. Step 1 — Calculate the required increase: 8° − 5° = 3° of additional downward tilt at the lens plane.
  2. Step 2 — Using frame-alignment pliers at the endpiece-to-temple junction, gently increase downward bend, making small incremental moves.
  3. Step 3 — After each micro-adjustment, place the frame on the head model or the patient and re-measure with a protractor against the lens plane.
  4. Step 4 — Stop when the protractor reads 8° (acceptable range: 7°–9°, i.e., within ±1° of target). Record the before (5°) and after (8°) values in the bench log.
Answer: 3° of additional pantoscopic tilt is needed. Confirm with a protractor reading of 8° ± 1° and document in the bench log.
3. After widening pad spread, you re-measure and find the left pad is now 1 mm higher than the right pad. The right pad is at the correct height. How do you correct this with pad-arm pliers?
  1. Step 1 — Only the left pad needs adjustment; the right pad is correct, so do not touch it.
  2. Step 2 — Using pad-arm pliers at the base of the left pad arm, apply downward pressure to lower the left pad by 1 mm.
  3. Step 3 — Re-measure both pad heights relative to the bridge or a reference line on the frame to confirm they are now level.
  4. Step 4 — Visually inspect the left pad arm for any tool marks; note the adjustment in the bench log.
Answer: Lower only the left pad arm by 1 mm using pad-arm pliers; verify both pads are at equal height and record the change.
4. A patient reports that the right temple presses firmly against the skull and causes discomfort after 30 minutes. The left temple feels fine. What direction is the temple bend adjusted, and roughly how should you proceed?
  1. Step 1 — Excessive skull pressure means the temple bend is too acute (the temple tip is angled too close to the head), creating too much tension on the right side only.
  2. Step 2 — Using pliers at the temple bend point on the right temple only, slightly open (widen) the bend angle to move the temple tip away from the skull, reducing contact pressure.
  3. Step 3 — Make a small adjustment, then have the patient (or classmate) wear the frame for a brief period and rate comfort on the 1–5 scale.
  4. Step 4 — Repeat in small increments if needed. The frame must still stay on the head securely; do not open the bend so far that the frame becomes loose.
Answer: Open the right temple bend slightly to reduce pressure against the skull; confirm improved comfort rating and retained frame retention.

The math in this lesson1

Learners split a 2 mm pad-spread change into 1 mm per pad arm and re-measure.
7.EE.3
In class: Instructor demonstrates correct use of pad-arm pliers, angling pliers, and frame-alignment pliers on a variety of metal frame styles (zyl-coated metal, titanium, memory metal), explaining why memory metal requires patient referral to the frame supplier for major adjustments rather than bench bending. · Students perform a series of prescribed adjustments on metal practice frames: widen pad spread by 2 mm, reduce pad spread by 2 mm, raise one pad, increase pantoscopic tilt by 3°, and tension both temples — recording before and after measurements in a bench log. · Students fit a metal frame on a classmate, identify two specific fit problems by patient feedback (nose bridge slipping, one temple pressing the skull), plan and execute the bench corrections, refit, and have the classmate re-evaluate comfort on a 1–5 scale before and after.
Materials: Pad-arm pliers, angling pliers, alignment pliers, metal practice frames (various styles including titanium), bench log forms, ruler, protractor, head models, magnifying visor
Check: Instructor bench evaluation: all five prescribed adjustments within ±1 mm or ±1° of target, no visible tool marks on frame finish, bench log complete; pass mark: 4 of 5 adjustments acceptable.

Practice check8

Answer each question, then check it. Nothing is recorded; this is your own practice.

ABO — Frame and Lens Dispensing
1. Which plier is specifically designed to rotate a nose pad around the long axis of its arm to achieve full pad-face contact with the nasal tissue?
ABO — Frame and Lens Dispensing
2. A patient's metal frame keeps sliding down the nose during wear. After inspection you find the nose pads are sitting too low and the pad spread is wider than the nasal bridge. Which combination of adjustments is MOST appropriate?
ABO — Frame and Lens Dispensing
3. Why is bench bending generally NOT recommended for major adjustments to memory-metal frames?
ABO — Frame and Lens Dispensing
4. The standard range of pantoscopic tilt for most patients is approximately:
ABO — Frame and Lens Dispensing
5. A student is adjusting a zyl-coated metal frame and applies bare-jawed pad-arm pliers directly to the coated section of the frame front. What is the MOST likely consequence?
ABO — Frame and Lens Dispensing
6. During a bench lab, a student must widen the pad spread from 30 mm to 32 mm symmetrically. How far should each pad arm be moved?
ABO — Frame and Lens Dispensing
7. Which material characteristic makes titanium frames particularly vulnerable to fracture if a single spot is bent back and forth multiple times?
ABO — Frame and Lens Dispensing
8. After adjusting a classmate's metal frame, the classmate rates comfort as 4 out of 5, up from 2 out of 5 before adjustment. The optician's bench log shows before/after measurements but no record of which specific adjustments were made. What is the MOST important corrective action?
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