# PWR-229 — Low-light operational capability: learner worksheet Release: Revision 7T · Full Tutorial Edition Estimated time: Estimated 10 min reading; practical time is provider-set Difficulty: Intermediate Equipment: Common household or practice equipment — Specialist-controlled room with measured low-light level and a normal-light switch within immediate reach.; Ten high-contrast benign target cards and ten distractors on a fixed tabletop grid.; Approved task light/instrument, glasses or aids, detection sheet, false-alarm log and observer. Space: Room-scale practice space Automated structural checklist: 10 of 10 structural checks present Evidence quality/context: G4; Focused research depth Automated method-quality band: Comprehensive Method-rating basis: Structure coverage, instruction/check specificity, alternative distinctness, source troubleshooting, comparison depth and whether purpose/check fields are authored rather than derived. Editorial review: Pending manual editorial sign off ## Before you begin - [ ] I read the tutorial authority and stop conditions. - [ ] I have the required equipment/space or a declared accessible alternative. ## Canonical source context This lesson teaches a specialist-controlled low-light method: assess visual and medical factors, record luminance and equipment, clear the workspace in ordinary light, allow the provider-set transition, scan systematically, verify targets with instruments or lights, handle bright-light disruption and stop when detection is unreliable. It is not night vision or a blindfold drill. Target outcome: The learner and specialist complete a versioned low-light target-search task with recorded luminance, detection and false-alarm scores, equipment use, adaptation reset and safe fallback. ### Authority and setup conditions - Report eye conditions, recent visual change, migraine/seizure sensitivity, balance concerns and medicines to the specialist. - In full light, clear the room, inspect the table, mark boundaries and rehearse the light-on stop route. - Record luminance, target contrast/size, equipment, viewing distance, transition time and maximum trial duration. ### Required or supplied materials - Specialist-controlled room with measured low-light level and a normal-light switch within immediate reach. - Ten high-contrast benign target cards and ten distractors on a fixed tabletop grid. - Approved task light/instrument, glasses or aids, detection sheet, false-alarm log and observer. ## 1. Define the visible task Name the exact stationary target, contrast, distance and required response; exclude movement and safety decisions. Why: “See better in the dark” cannot be scored. Success check: The task card specifies target and low-light configuration. Accessible alternative: Ask the qualified provider to adapt positioning, cue modality, pace, interface or rest while preserving this step’s declared check: “The task card specifies target and low-light configuration.” If an adaptation changes the measured task or configuration, record it as a different configuration rather than an equivalent attempt. Alternative relationship: Conditional equivalence requires target and configuration check Learner notes: ________________________________________________________________________________ Completed: [ ] ## 2. Capture normal-light baseline Search the grid in normal light and record misses, false alarms and time. Why: Baseline confirms task understanding and card visibility. Success check: All targets can be identified before lighting changes. Accessible alternative: Ask the qualified provider to adapt positioning, cue modality, pace, interface or rest while preserving this step’s declared check: “All targets can be identified before lighting changes.” If an adaptation changes the measured task or configuration, record it as a different configuration rather than an equivalent attempt. Alternative relationship: Conditional equivalence requires target and configuration check Learner notes: ________________________________________________________________________________ Completed: [ ] ## 3. Prepare the fallback With lights on, practise stopping, freezing hands/feet and switching to approved light or calling the observer. Why: Low-light competence includes ending the task safely. Success check: The learner reaches light or help without moving through darkness. Accessible alternative: Ask the qualified provider to adapt positioning, cue modality, pace, interface or rest while preserving this step’s declared check: “The learner reaches light or help without moving through darkness.” If an adaptation changes the measured task or configuration, record it as a different configuration rather than an equivalent attempt. Alternative relationship: Conditional equivalence requires target and configuration check Learner notes: ________________________________________________________________________________ Completed: [ ] ## 4. Transition under provider control The specialist lowers lighting to the declared level and starts the planned adaptation interval; the learner remains stationary. Why: Visual sensitivity changes over time and can be reset by bright light. Success check: Start time and any bright-light interruption are recorded. Accessible alternative: Ask the qualified provider to adapt positioning, cue modality, pace, interface or rest while preserving this step’s declared check: “Start time and any bright-light interruption are recorded.” If an adaptation changes the measured task or configuration, record it as a different configuration rather than an equivalent attempt. Alternative relationship: Conditional equivalence requires target and configuration check Learner notes: ________________________________________________________________________________ Completed: [ ] ## 5. Use a fixed scan path Move gaze through the grid in an agreed row or clock pattern, pause briefly at each sector and mark only a detected target. Why: A repeatable path reduces unsearched gaps. Success check: Every sector is searched once without random rescanning. Accessible alternative: Ask the qualified provider to adapt positioning, cue modality, pace, interface or rest while preserving this step’s declared check: “Every sector is searched once without random rescanning.” If an adaptation changes the measured task or configuration, record it as a different configuration rather than an equivalent attempt. Alternative relationship: Conditional equivalence requires target and configuration check Learner notes: ________________________________________________________________________________ Completed: [ ] ## 6. Verify before acting Use the approved task light or instrument when the target is ambiguous; mark uncertain rather than guessing. Why: Low contrast makes benign shadows resemble targets and raises false-alarm counts. Success check: Every uncertain card is verified or left unresolved. Accessible alternative: Ask the qualified provider to adapt positioning, cue modality, pace, interface or rest while preserving this step’s declared check: “Every uncertain card is verified or left unresolved.” If an adaptation changes the measured task or configuration, record it as a different configuration rather than an equivalent attempt. Alternative relationship: Conditional equivalence requires target and configuration check Learner notes: ________________________________________________________________________________ Completed: [ ] ## 7. Record misses and false alarms Compare the locked response with the answer map and separate failure to detect from incorrect identification. Why: Speed alone can reward rapid guesses instead of accurate low-light discrimination. Success check: The sheet reports both detection and false-alarm rates. Accessible alternative: Ask the qualified provider to adapt positioning, cue modality, pace, interface or rest while preserving this step’s declared check: “The sheet reports both detection and false-alarm rates.” If an adaptation changes the measured task or configuration, record it as a different configuration rather than an equivalent attempt. Alternative relationship: Conditional equivalence requires target and configuration check Learner notes: ________________________________________________________________________________ Completed: [ ] ## 8. Handle bright-light reset The specialist introduces a safe brief light-on interruption while the learner is stationary; the learner stops, records reset and waits the prescribed transition again. Why: Bright light can disrupt dark adaptation. Success check: No post-flash result is mixed with the earlier adapted block. Accessible alternative: Ask the qualified provider to adapt positioning, cue modality, pace, interface or rest while preserving this step’s declared check: “No post-flash result is mixed with the earlier adapted block.” If an adaptation changes the measured task or configuration, record it as a different configuration rather than an equivalent attempt. Alternative relationship: Conditional equivalence requires target and configuration check Learner notes: ________________________________________________________________________________ Completed: [ ] ## 9. Test equipment and no-equipment states Compare approved aid-on and aid-off only if the specialist says both are safe; normal aids remain. Why: This shows configuration dependence without manufacturing danger. Success check: Each score names every light, instrument and aid used. Accessible alternative: Ask the qualified provider to adapt positioning, cue modality, pace, interface or rest while preserving this step’s declared check: “Each score names every light, instrument and aid used.” If an adaptation changes the measured task or configuration, record it as a different configuration rather than an equivalent attempt. Alternative relationship: Conditional equivalence requires target and configuration check Learner notes: ________________________________________________________________________________ Completed: [ ] ## 10. End on reliability, not endurance Stop at the time limit or when misses, symptoms or orientation exceed the rule, then restore full light before moving. Why: Fatigue and prolonged darkness can worsen safety. Success check: The learner moves only after normal lighting and orientation return. Accessible alternative: Ask the qualified provider to adapt positioning, cue modality, pace, interface or rest while preserving this step’s declared check: “The learner moves only after normal lighting and orientation return.” If an adaptation changes the measured task or configuration, record it as a different configuration rather than an equivalent attempt. Alternative relationship: Conditional equivalence requires target and configuration check Learner notes: ________________________________________________________________________________ Completed: [ ] ## Reflection What changed? ________________________________________________________________________________ What remains difficult? ________________________________________________________________________________ What will I repeat, adapt, ask for help with, or stop? ________________________________________________________________________________ --- Completion of this worksheet demonstrates tutorial participation only. It does not establish capability, qualification, safety clearance, diagnosis, treatment or independent validation.