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DHA Ophthalmic Technician (DHA-OT) Resources
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Understanding the exact breakdown of the DHA Ophthalmic Technician test will help you know what to expect and how to most effectively prepare. The DHA Ophthalmic Technician has 70 multiple-choice questions . The exam will be broken down into the sections below:
| DHA Ophthalmic Technician Exam Blueprint | ||
|---|---|---|
| Domain Name | % | Number of Questions |
| History Taking | 6% | 4 |
| Pupillary Assessment | 5% | 4 |
| Contact Lenses | 3% | 2 |
| Equipment Maintenance And Repair | 4% | 3 |
| Lensometry | 5% | 4 |
| Keratometry | 5% | 4 |
| Medical Ethics - Legal And Regulatory Issues | 3% | 2 |
| Microbiology | 3% | 2 |
| Pharmacology | 5% | 4 |
| Ocular Motility | 5% | 4 |
| Assisting In Surgical Procedures | 6% | 4 |
| Ophthalmic Patient Services & Education | 7% | 5 |
| Ophthalmic Imaging | 7% | 5 |
| Refractometry | 7% | 5 |
| Spectacle Skills | 3% | 2 |
| Supplemental Skills | 9% | 6 |
| Tonometry | 5% | 4 |
| Visual Assessment | 6% | 4 |
| Visual Fields | 6% | 4 |
DHA Ophthalmic Technician Study Tips by Domain
- Use a structured chief complaint with OLDCARTS and document laterality (OD/OS/OU) — red flag if the patient can’t localize symptoms or reports “both eyes” inconsistently.
- Screen urgently for red-flag symptoms: sudden vision loss, flashes/floaters with a curtain, severe eye pain, trauma, chemical exposure, or halos with nausea — priority rule: escalate immediately rather than continuing routine history.
- Capture ocular history precisely (prior surgery/laser, injections, trauma, glaucoma/retinal disease) — common trap: missing post-op timing (e.g., within weeks) which changes triage and precautions.
- Take a focused medication/allergy history including anticoagulants, steroids (topical/systemic), alpha-blockers (e.g., tamsulosin), and drops used today — contraindication cue: suspect allergy if prior anaphylaxis/angioedema to drops or preservatives.
- Document systemic history relevant to eye care (diabetes, hypertension, thyroid disease, autoimmune disease, pregnancy) — threshold cue: any diabetic with new vision change is treated as urgent due to possible macular edema/retinopathy.
- Clarify vision needs and functional impact (driving, work screens, reading) and current correction (glasses/CL type, wear schedule, last exam) — common trap: not recording contact lens overwear, a key clue in painful red eye.
- Assess pupils in a consistent sequence: size/shape, equality, direct/consensual light response, and accommodation; red flag—new anisocoria (≥1 mm) that is greater in bright vs dim light suggests different urgent pathways.
- Document pupil size in mm under photopic and scotopic conditions; common trap—failing to standardize room illumination can create false asymmetry or mask a subtle defect.
- Perform a swinging flashlight test to detect a relative afferent pupillary defect (RAPD); priority rule—any RAPD is significant and warrants prompt clinician notification even if visual acuity seems acceptable.
- Differentiate physiologic anisocoria from pathologic by checking stability across lighting and reviewing prior records/photos; red flag—acute anisocoria with ptosis and diplopia may indicate a neurologic emergency.
- Account for confounders (miotics, mydriatics, opioids, trauma, intraocular surgery) before concluding pathology; common trap—not asking about recent eye drops or aerosol exposure (e.g., anticholinergics) leading to misinterpretation.
- Ensure infection control and patient safety during close facial work (hand hygiene, avoid touching ocular surface with light source); contraindication—do not apply pressure to a potentially ruptured globe when lifting lids to view the pupil.
- Verify lens type and parameters before insertion (base curve, diameter, power, material) — red flag: mismatch between ordered and dispensed lenses is a common cause of poor vision and non-tolerance.
- Assess fit systematically (centration, movement, coverage, push-up test) — priority rule: a tight lens with minimal movement increases hypoxia risk, especially with extended wear.
- Differentiate normal adaptation from pathology — contraindication cue: pain, photophobia, reduced vision, or corneal staining warrants lens removal and prompt clinician escalation.
- Teach hygiene and solution use precisely — common trap: topping-off, water exposure (shower/swim), or using saliva raises microbial keratitis risk (think Acanthamoeba).
- Manage common complications (dryness, GPC, infiltrates) with practical steps — red flag: multiple peripheral infiltrates with redness may signal CLARE/keratitis and should not be treated as simple irritation.
- Document wear schedule, replacement frequency, and follow-up — DHA-style compliance cue: non-adherence (overnight wear in daily lenses, overdue replacement) is a high-yield risk factor to record and counsel.
- Perform daily function checks and calibration logs for key devices (e.g., tonometer, autorefractor, perimeter); red flag: using equipment when QC is out of range or undocumented violates DHA-style audit expectations.
- Follow manufacturer cleaning/disinfection instructions exactly for patient-contact parts; common trap: using alcohol or harsh wipes on coated optics/corneal applanation tips can cause permanent damage and inaccurate readings.
- Inspect cables, probes, bulbs, and moving parts before clinic starts and remove unsafe devices from service immediately; priority rule: if there’s frayed wiring, intermittent power, or visible cracks, tag “Do Not Use” and escalate.
- Protect optics and sensors with proper storage (dust caps, covers, stable temperature/humidity); red flag: condensation, fungus, or dust on lenses can mimic pathology or degrade image quality in documented exams.
- Troubleshoot systematically (power source → connections → settings → calibration → test patient); common trap: adjusting internal settings without authorization can void warranty and compromise medico-legal defensibility.
- Document maintenance, repairs, and consumable replacements with date, serial number, and who performed the work; red flag: missing traceability (especially after a repair) can invalidate comparative results across visits.
- Verify patient ID and prescription details before neutralizing lenses; red flag: OD/OS swapped or cyl axis written in plus-cylinder when you’re recording in minus-cylinder (or vice versa).
- Start with the right lens and locate the optical center and major/minor meridians accurately; common trap: reading prism because the lens isn’t centered on the lens stop.
- Measure sphere, cylinder, and axis by aligning the mires sharply and confirming axis stability; red flag: fluctuating axis often indicates lens tilt or an unlevel instrument table.
- Record prism amount and base direction using the reticle and prism compensator; priority rule: document prism as base-in/out/up/down for each eye, not just the magnitude.
- Check progressive addition lenses by identifying the fitting cross and verifying distance/near powers at the correct reference points; common trap: taking the add reading at the optical center instead of the near reference point.
- Confirm UV/blue-filter marks and lens type (single vision, bifocal, PAL) while noting significant power discrepancies; red flag: more than ~0.50 D unexpected difference from the prescription warrants re-check and supervisor escalation per facility policy.
- Verify the patient’s identity, remove contact lenses, and ensure a stable tear film before readings; red flag: dry eye or recent RGP wear can flatten/warp K values and should be documented.
- Positioning is non-negotiable—align chin/forehead, instruct steady fixation, and center mires; common trap: decentered mires falsely increase cylinder or suggest irregular astigmatism.
- Know what you are measuring: standard keratometry samples a small central zone and assumes a regular cornea; priority rule: if mires are distorted or doubled, proceed to topography/referral rather than forcing a number.
- Record K readings correctly (flat/steep meridians with axis) and note the instrument used; red flag: mixing diopters and mm without conversion (337.5/r) leads to wrong IOL/contact lens calculations.
- Quality-check repeatability—take multiple readings and look for consistency; common trap: accepting single-shot values when variability suggests poor fixation, blinking, or tear instability.
- Apply keratometry clinically: baseline for astigmatism, CL base curve selection, and pre-op cataract planning; contraindication cue: post-refractive surgery (LASIK/PRK) K readings can be misleading and must be flagged for the surgeon.
- Apply patient confidentiality and minimum-necessary disclosure in all communications; red flag: discussing cases in public areas or sharing images/records on personal devices.
- Confirm valid informed consent before procedures (e.g., dilation, contact tonometry, imaging) and document appropriately; common trap: assuming verbal consent covers additional tests or off-label drops.
- Follow DHA facility policies for patient identification and “time-out” in procedures; priority rule: use at least two identifiers and pause if any mismatch appears on wristband, chart, or order.
- Maintain clear scope-of-practice boundaries for an ophthalmic technician; red flag: independently diagnosing, prescribing, or altering a clinician’s treatment plan without authorization.
- Handle medico-legal documentation carefully—chart contemporaneously, objectively, and with corrections per policy; common trap: backdating entries or using nonstandard abbreviations that can be misinterpreted.
- Report safety events and suspected abuse/neglect per DHA and facility requirements; priority rule: escalate immediately for threats to vision or life and document who was notified and when.
- Differentiate common ocular pathogens: bacteria (acute purulent), viruses (watery with preauricular node), fungi (feathery infiltrate) — red flag: contact lens wearer with pain and corneal infiltrate is keratitis until proven otherwise.
- Know specimen collection basics (swab, scrape, transport medium) and timing — common trap: starting topical antibiotics before culture can yield false-negative results, especially in suspected microbial keratitis.
- Apply infection control for adenoviral conjunctivitis — priority rule: assume high contagion and disinfect tonometer tips, chin rests, and imaging surfaces between patients to prevent clinic outbreaks.
- Recognize Acanthamoeba risk — red flag: severe pain out of proportion to signs in a contact lens user (especially water exposure) should trigger urgent escalation and strict lens-case hygiene counseling.
- Understand normal flora vs. true infection — common trap: overinterpreting mild lid margin colonization; correlate with clinical signs (ulcer, anterior chamber reaction) before labeling as microbial keratitis.
- Know basic antimicrobial stewardship principles — priority rule: avoid indiscriminate broad-spectrum drops for simple viral conjunctivitis and escalate immediately for corneal ulcers or endophthalmitis suspicion (decreased vision, hypopyon).
- Always verify the “five rights” (patient, drug, dose, route, time) before instilling drops; red flag: giving mydriatics to the wrong patient can compromise exam findings and safety.
- Screen for contraindications to dilation (e.g., narrow angles/known angle-closure risk) and escalate per DHA facility policy; common trap: dilating without checking for prior angle-closure history or current severe headache/halos.
- Topical anesthetics are for in-clinic procedures only (tonometry, foreign body removal) and not for take-home use; red flag: repeated dosing can cause corneal toxicity and delayed healing.
- Recognize key adverse reactions and act quickly—vasovagal syncope, allergy, bronchospasm; priority rule: stop the drug, position the patient safely, and seek urgent clinician support if breathing or consciousness is affected.
- Use punctal occlusion for 1–2 minutes after drops in children, pregnant patients, and those with cardiac/respiratory disease; common trap: forgetting this increases systemic absorption (e.g., beta-blockers causing bradycardia/bronchospasm).
- Maintain safe medication handling—check expiry, avoid touching the bottle tip, and follow single-use/multi-dose labeling; red flag: using contaminated drops can cause iatrogenic infection and is a DHA compliance issue.
- Differentiate comitant vs incomitant strabismus early—red flag: incomitance (angle changes with gaze) suggests paretic/restrictive cause and warrants prompt escalation.
- When testing ductions/versions, control head posture; common trap: missing an oblique palsy because the patient tilts the head instead of moving the eyes.
- Use cover–uncover to detect tropia and alternate cover to reveal phoria; priority rule: always note fixation target distance (near vs distance) because deviations can change significantly.
- In suspected cranial nerve palsy, map limitation patterns (III: multiple directions/ptosis, IV: worse on downgaze, VI: abduction deficit); red flag: acute painful diplopia requires urgent referral.
- Perform near point of convergence and assess for convergence insufficiency; practical cue: break >10 cm with symptoms (asthenopia, headaches) is a common exam threshold to document.
- Check for nystagmus type (jerk vs pendular) and whether it dampens with fixation; red flag: new-onset nystagmus or associated neurologic signs mandates immediate clinician notification.
- Verify patient identity, procedure, laterality, and consent before prep—red flag: any mismatch between chart, wristband, and marked eye requires an immediate stop and escalation.
- Maintain strict aseptic technique during draping, instrument handling, and field boundaries—common trap: reaching over or touching the sterile field with non-sterile gloves/gown contaminates the setup.
- Prepare and confirm correct intraocular lens (IOL) details (power, type, A-constant notes) and required disposables before incision—priority rule: no lens opens until surgeon and team confirm model and power on the case board.
- Anticipate and pass instruments safely (neutral zone, tip awareness) and track sharps—red flag: an unaccounted needle/blade triggers an immediate count and search before closure or patient transfer.
- Support intraoperative medication safety by labeling all syringes/bowls and reading back drug/concentration—common trap: unlabeled balanced salt solution vs anesthetic/antibiotic can cause wrong-route or toxic exposure.
- Post-procedure, apply ordered dressing/shield, provide discharge precautions, and document counts and any events—red flag: severe pain, sudden vision loss, nausea/vomiting, or increasing redness after surgery warrants urgent surgeon notification.
- Verify patient identity with two identifiers and confirm laterality/time-out before any procedure; red flag: mismatch between referral note and patient’s stated complaint or eye.
- Give post-dilation safety advice (blurred vision/photophobia, driving caution) and document understanding; common trap: discharging without advising on driving restrictions and sunglasses.
- Use clear escalation criteria for urgent symptoms (sudden vision loss, severe pain, flashes/floaters with curtain, chemical exposure) — treat as same-day emergency; red flag: “new floaters + shadow” after trauma.
- Teach and observe eye-drop instillation (hand hygiene, avoid bottle-tip contact, punctal occlusion 1–2 minutes when indicated); common trap: patients contaminating the tip or using drops back-to-back without spacing 5 minutes.
- For contact precautions and infection prevention, enforce hand hygiene and appropriate PPE with suspected conjunctivitis or keratitis; red flag: contact lens wearer with pain/photophobia — prioritize immediate clinician review.
- Provide culturally sensitive education and DHA-aligned consent/privacy practices — use interpreter services for limited Arabic/English proficiency; common trap: relying on family translation for consent or disclosing results in public areas.
- Verify patient identifiers and laterality before any capture; red flag: images labeled OD/OS incorrectly can invalidate DHA documentation and misdirect treatment.
- For fundus photography, achieve proper focus, centration (macula/optic disc as ordered), and illumination; common trap: small pupil or media opacity causing low-quality images—document the limitation rather than over-adjusting exposure.
- In OCT, confirm scan protocol (macula vs RNFL) and signal strength meets clinic threshold (e.g., acceptable quality score per device); red flag: motion artifact or segmentation errors—repeat or flag for clinician review.
- For fluorescein angiography support, screen for allergy/asthma history and monitor for nausea or urticaria; contraindication cue: suspected fluorescein hypersensitivity—stop and escalate immediately.
- In corneal/topography imaging, ensure proper tear film and remove contact lenses per policy (soft often 24 hours, rigid longer); common trap: dry eye or recent lens wear creating false steepening/irregularity.
- Maintain infection control and device hygiene (chin rest/forehead strap disinfection between patients); red flag: improper disinfection can breach DHA infection-control expectations and risks cross-contamination.
- Verify patient ID and refraction purpose (distance vs near vs both) before starting—red flag: skipping chief complaint often leads to over-minus in asthenopia or accommodative spasm.
- Begin with objective refraction (autorefractor/retinoscopy) then refine subjectively—common trap: relying on autorefraction alone when media opacity, dry eye, or poor fixation is present.
- Apply fogging and keep binocular balance in mind for distance refraction—priority rule: avoid giving the most minus that yields 6/6 if plus acceptance suggests latent hyperopia.
- Refine cylinder with JCC/axis bracketing in small steps—red flag: large axis jumps (e.g., >10–15°) usually indicate inconsistent responses or uncorrected vertex/working distance issues.
- Use proper vertex distance when converting high prescriptions—threshold cue: for powers around ±4.00 D and higher, neglecting vertex changes can meaningfully alter the effective correction.
- Document VA, refraction steps, and final Rx clearly and comply with DHA documentation expectations—common trap: recording sphere/cyl/axis without measured VA or near add rationale, which can fail audit/clinical review.
- Verify the prescription against the order (OD/OS, sphere/cylinder/axis, add, prism base direction) before dispensing—common trap: transposing OD/OS or misreading axis (e.g., 15 vs 150).
- Confirm pupillary distance (distance vs near PD) and correct decentration; red flag: patient reports headaches/diplopia with new glasses, often from incorrect PD or vertical height measurements.
- Check lens type and treatments (single vision, bifocal/progressive, photochromic, anti-reflective) match the patient’s task needs; priority rule: computer users often need occupational designs rather than standard progressives.
- Inspect frame fit and alignment (pantoscopic tilt, face form, bridge fit, temple length) and adjust before judging vision; common trap: chasing refraction when the frame is crooked or sitting too low.
- For progressive lenses, measure and mark fitting height accurately and ensure pupils align with the fitting cross; red flag: “swim” or narrow clear zone suggests incorrect height, tilt, or wrong corridor length.
- Educate on adaptation and care (cleaning, avoiding heat, safe storage) and document complaints objectively; DHA compliance cue: do not alter or remake without proper authorization and clear record of measurements and findings.
- Perform aseptic technique for minor in-clinic procedures (e.g., foreign body removal assist, lacrimal irrigation setup)—red flag: any break in sterility (touching tip/field) requires re-prep and new sterile supplies.
- Apply and remove ocular dressings/shields correctly—trap: pressure patch is contraindicated when open-globe injury is suspected; use a rigid shield and avoid pressure.
- Support pre-op/post-op workflow (vitals, consent verification, marking checks, patient ID)—priority rule: follow DHA-style “two identifiers” and never proceed if site/procedure/patient mismatch is noted.
- Provide basic emergency response for ocular exposures/trauma—threshold: chemical splash demands immediate copious irrigation before history-taking or visual acuity, then pH recheck until neutral.
- Assist with pediatric/low-vision/disabled patient positioning and communication—common trap: restraining without explanation/escalation increases risk; use caregiver support and document cooperation limits.
- Handle specimens and sharps safely (labels, transport, disposal)—red flag: unlabeled or mismatched specimen identifiers must not be sent; correct at source and complete incident reporting per facility policy.
- Differentiate methods: Goldmann applanation is the reference standard; noncontact and Tono-Pen readings can drift—red flag if values differ >3–4 mmHg from expected or between eyes without explanation.
- Before applanation, confirm no contraindication to contact (suspected open globe, recent corneal surgery/trauma, active infection)—common trap is touching an injured cornea and worsening the injury.
- Use fluorescein with cobalt blue for applanation and aim for correct mires; priority rule: too much fluorescein or excessive lid pressure falsely elevates IOP.
- Account for corneal factors: thick cornea can overestimate and thin cornea can underestimate IOP—red flag when IOP seems discordant with optic nerve/field findings.
- Infection control is mandatory: disinfect tips per facility policy between patients and avoid cross-contamination—common trap is inadequate soak/contact time for disinfectant.
- Document clearly (method, eye, time, patient position/behavior); priority rule: repeat and recheck if patient is squeezing, Valsalva, or holding breath because this can artifactually raise IOP.
- Verify patient identity and the correct eye before testing acuity; red flag: documenting OD/OS incorrectly is a frequent DHA-style documentation error with clinical impact.
- Distance visual acuity must use standardized illumination and correct test distance (e.g., 6 m/20 ft); common trap: allowing the patient to squint or lean forward artificially improves acuity.
- Always test uncorrected then best-corrected acuity (with glasses or pinhole if no correction available); priority rule: a pinhole improvement suggests refractive error rather than pathology.
- Near vision assessment requires appropriate working distance and the patient’s near add if prescribed; red flag: reduced near only can indicate presbyopia, not necessarily disease.
- Record acuity precisely (e.g., 6/12, 20/40, count fingers/hand motion/light perception with projection); common trap: writing “poor vision” instead of a measurable level is noncompliant and non-actionable.
- Assess color vision and contrast when indicated (e.g., optic neuropathy, cataract complaints); red flag: new dyschromatopsia out of proportion to acuity warrants prompt escalation.
- Differentiate central field testing (e.g., 24–2/30–2, 10–2) from peripheral kinetic testing (e.g., Goldmann)—red flag: new neuro symptoms or markedly constricted fields warrant urgent escalation rather than routine repeat.
- Prioritize reliability indices before interpretation: high fixation losses, false positives, or false negatives make the printout non-actionable—common trap: calling progression on an unreliable test.
- Use correct refractive correction and test distance (near add for short working distance) to avoid generalized depression—red flag: diffuse sensitivity loss that resolves after proper trial lens placement.
- Coach patient technique (steady fixation, blink between stimuli, respond only when seen) and pause/restart if fatigue sets in—priority rule: better a shorter reliable field than a full unreliable one.
- Recognize artifact patterns: lid droop/ptosis, rim artifact from poor trial lens position, and lens edge effects can mimic defects—common trap: interpreting a superior arcuate defect when the upper lid is blocking.
- Correlate field loss patterns with anatomy (glaucomatous arcuate/nasal step vs. neuro chiasmal bitemporal) and repeat to confirm change—red flag: sudden homonymous defects require prompt clinician notification.
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DHA Ophthalmic Technician Aliases Test Name
Here is a list of alternative names used for this exam.
- DHA Ophthalmic Technician
- DHA Ophthalmic Technician test
- DHA Ophthalmic Technician Certification Test
- DHA
- DHA DHA-OT
- DHA-OT test
- DHA Ophthalmic Technician (DHA-OT)
- Ophthalmic Technician certification
