NBEO Part III common mistakes
NBEO Part III · Understand the traps and how to avoid them.
Starting the station's practical task (e.g., ophthalmoscopy, Goldmann tonometry) before completing a structured history or explaining the procedure to the patient, so the examiner marks down communication and the candidate later discovers a contraindication or relevant symptom they never elicited.
Candidates rehearse technical sequences in isolation and treat the history as a formality; time pressure in a timed station makes them skip the 'talk first' habit they never practiced under exam conditions.
What to do instead
Adopt a fixed opening script for every station: introduce yourself, confirm patient identity and consent, state what you will do and whether it is uncomfortable, then ask two or three targeted questions relevant to the task (e.g., for tonometry: prior eye surgery, current eye drops, known allergy to anesthetic). Practice this script aloud until it is automatic, and rehearse each technical station only after the script is delivered.
Recording a single distance acuity without pinhole, without a near acuity, and without documenting the method (chart type, testing distance, correction worn), producing a record that cannot be interpreted or repeated.
Candidates memorize the Snellen procedure but not the documentation standard, and in a hurry they omit the pinhole because it 'adds time' rather than recognizing it as the key discriminator between refractive and ocular causes of reduced acuity.
What to do instead
Use a fixed documentation template for every acuity measurement: chart used, distance, correction status (with/without/sc) and both eyes separately, then pinhole if acuity is below the expected level. Practice writing the record entry in the same order every time so no field is dropped under pressure.
Performing cover testing without first establishing fixation target and without holding the cover long enough to reveal a latent deviation, then reporting 'no strabismus' when a dissociated phoria or intermittent deviation was present.
Candidates watch for obvious tropias and stop once the eyes look straight; they underestimate how long a cover must be held and how a near versus distance target changes the result.
What to do instead
Standardize the sequence: alternate cover at distance and near with an accommodative target, hold each cover for at least three to five seconds, and observe the uncovered eye for movement before moving the paddle. Practice on a partner with a known small phoria so you learn what a slow recovery looks like, and record the magnitude and recovery speed, not just 'present/absent'.
Using the slit lamp with the illumination beam too wide or too bright and the magnification too low, so subtle corneal findings (microcysts, faint infiltrates, endothelial changes) are missed and the patient is unnecessarily dazzled.
Candidates default to the settings left by the previous user and are anxious about adjusting the joystick and beam controls mid-examination; low magnification feels safer because it keeps the whole eye in view.
What to do instead
Before each patient, deliberately reset the instrument: lowest reasonable illumination, narrow optic section, low magnification to locate, then increase magnification and narrow the beam for the structure of interest. Rehearse a fixed sweep (lids, conjunctiva, cornea with optic section, anterior chamber with a narrow beam, iris, lens with retroillumination) so beam adjustments become a habit rather than an afterthought.
Attempting direct ophthalmoscopy at too great a working distance, without dimming room lights or dilating when appropriate, and reporting the disc as 'normal' without actually locating the margins and estimating the cup-to-disc ratio.
Candidates are uncomfortable being close to the patient and lose the vessel trail; once the view is poor they accept a vague impression rather than troubleshooting distance, focus, and illumination.
What to do instead
Practice finding the disc by following a vessel from the patient's optic axis while starting close (within a few centimeters) and slowly withdrawing while adjusting the focusing wheel. Dim the room, use the patient's fellow eye to fixate a distant target, and force yourself to state disc margin, color, cup-to-disc ratio, and vessel status aloud before moving on.
Applying the tonometer prism to the cornea without confirming adequate anesthesia and fluorescein, without checking that the mires are properly aligned and separated, and without calibrating or verifying the instrument's zero position before use.
Candidates focus on obtaining a number quickly and skip the preparatory checks; misaligned mires still produce a reading, so the error is invisible unless the candidate knows what correct mires look like.
What to do instead
Build a pre-measurement checklist: confirm anesthetic and fluorescein instilled, patient positioned with forehead against the strap, slit lamp angled correctly, and instrument zeroed. Then verify the mires are semicircles of equal size meeting at the center before accepting any reading, and repeat until three consistent readings are obtained.
Relying on a single screening visual field method (e.g., confrontation only) as if it were equivalent to perimetry, or interpreting a field printout without checking reliability indices, fixation losses, and whether the patient understood the task.
Candidates conflate 'I checked the fields' with a formal test and are unfamiliar with reliability indices, so they accept an unreliable printout as diagnostic.
What to do instead
State explicitly which method you used and its limitations. For automated perimetry, always review fixation losses, false-positive and false-negative rates, and test duration before interpreting the pattern; if reliability is poor, repeat or note the limitation rather than drawing a conclusion. Practice reading several printouts and writing a one-line interpretation that cites the reliability data.
Assessing contact lens fit by comfort alone, without evaluating centration, coverage, movement, and fluorescein pattern, and without recording the parameters of the lens actually on the eye.
A comfortable lens feels like a success, and candidates under time pressure accept the patient's report instead of performing the objective evaluation they were taught.
What to do instead
Use a fixed fit-assessment sequence for every lens: centration, corneal coverage, lag and movement on blink, tightness on push-up test, and fluorescein pattern with the appropriate filter. Record base curve, diameter, power, and material before the patient leaves the chair, and state the fit judgment in objective terms rather than 'feels fine'.
Neutralizing lenses in the lensometer without first focusing the eyepiece to the candidate's own refractive error, and reading the power without verifying axis and without checking for prism or unwanted cylinder.
An unfocused eyepiece makes the target appear sharp at the wrong focal plane, producing systematically wrong sphere readings that the candidate never suspects because the target looks clear.
What to do instead
Begin every lensometry session by focusing the eyepiece on the reticle until the crosslines are sharp against a white background, then verify the instrument reads zero with no lens in place. Neutralize sphere first, then cylinder axis, then power, and confirm the result by rotating the lens and rechecking the axis alignment.
Instilling drops without confirming the correct medication, concentration, and eye, without checking for allergies or contraindications, and without occluding the punctum or documenting the instillation.
Candidates treat drop instillation as a trivial mechanical step and skip the verification ritual because it feels redundant in a teaching setting where the bottle is handed to them.
What to do instead
Verbalize a three-point check before every instillation: read the label aloud (drug, concentration, expiry), confirm the intended eye and any allergy history, then instill with punctal occlusion and record the drug, concentration, time, and eye. Treat this as a graded behavior in every practice station so it survives exam stress.
Communicating findings to the patient in unexplained jargon or, conversely, over-reassuring before the examination is complete, and failing to confirm the patient's understanding or invite questions.
Candidates concentrate on getting the technical steps right and treat the closing conversation as filler; under observation they rush the explanation and default to phrases they have heard clinicians use.
What to do instead
Use a closing structure: summarize what you found in plain language, state what happens next, ask the patient to repeat back the key point, and invite questions. Practice with a partner who deliberately asks 'what does that mean?' so you rehearse translating terms like 'cup-to-disc ratio' or 'cylinder' into everyday language.