# PWR-071 — Low-light adaptation: learner worksheet Release: Revision 7T · Full Tutorial Edition Estimated time: Estimated 27 min reading and worksheet pass Difficulty: Intermediate Equipment: Basic stationery or digital tools — An exact panel recipe for a helper using a slide or drawing program. Make every panel 8 cm square with background RGB 16/16/16 and one centred 4 cm shape: circle, equilateral triangle, square or five-point star. Shape grey levels are 1 = 112, 2 = 80, 3 = 56, 4 = 40, 5 = 32 and 6 = 24 in all three RGB channels. Export one of each shape at every level under neutral filenames. Fold the Set A order by level: 1 circle/triangle/square/star; 2 star/square/circle/triangle; 3 triangle/circle/star/square; 4 square/star/triangle/circle; 5 circle/star/square/triangle; 6 triangle/square/star/circle. Set B uses at each level: 1 star/circle/triangle/square; 2 triangle/star/square/circle; 3 square/triangle/circle/star; 4 circle/square/star/triangle; 5 star/triangle/circle/square; 6 square/circle/triangle/star.; One non-HDR display with brightness locked.; A normally lit room and fixed viewing distance.; Timer and record for prior light, panel level, accuracy, confidence and symptoms. Space: Desk / seated Automated structural checklist: 10 of 10 structural checks present Evidence quality/context: G2; 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 Dark adaptation is a temporary physiological process, not a permanent superpower, and recent bright light changes it. This safe fixture keeps the room navigable and dims only a set of fixed screen panels. The learner identifies simple shapes at declared display-grey levels after a matched light-history interval and resets after an accidental bright screen. It is not a rod threshold or night-driving test. Target outcome: The learner completes two matched dim-panel sets with controlled prior light, display settings and symptom-free object identification. ### Authority and setup conditions - Keep the room safely lit enough to move; remain seated. - Do not walk in darkness, drive, cover hazards or use extreme bright-light exposure. - Spend and record 15 minutes under the same ordinary room lamp with no full-screen white display before either set; this fixture standardises recent light but does not create clinical dark adaptation. - Use professional care for new night-vision difficulty. ### Required or supplied materials - An exact panel recipe for a helper using a slide or drawing program. Make every panel 8 cm square with background RGB 16/16/16 and one centred 4 cm shape: circle, equilateral triangle, square or five-point star. Shape grey levels are 1 = 112, 2 = 80, 3 = 56, 4 = 40, 5 = 32 and 6 = 24 in all three RGB channels. Export one of each shape at every level under neutral filenames. Fold the Set A order by level: 1 circle/triangle/square/star; 2 star/square/circle/triangle; 3 triangle/circle/star/square; 4 square/star/triangle/circle; 5 circle/star/square/triangle; 6 triangle/square/star/circle. Set B uses at each level: 1 star/circle/triangle/square; 2 triangle/star/square/circle; 3 square/triangle/circle/star; 4 circle/square/star/triangle; 5 star/triangle/circle/square; 6 square/circle/triangle/star. - One non-HDR display with brightness locked. - A normally lit room and fixed viewing distance. - Timer and record for prior light, panel level, accuracy, confidence and symptoms. ## 1. Make the room safe Remove trip hazards and keep navigation lighting on; only the panel is dim. Why: The lesson tests an image, not movement in darkness. Success check: The route remains fully visible. Accessible alternative: A supported, seated, reduced-range or slower version of “Remove trip hazards and keep navigation lighting on; only the panel is dim.” is equivalent only when it keeps the same trained or measured target, declared configuration and success check: “The route remains fully visible.” If any of those change, record it as a related alternative rather than an equivalent repetition. Alternative relationship: Conditional equivalence requires target and configuration check Learner notes: ________________________________________________________________________________ Completed: [ ] ## 2. Lock display and history Record display, brightness, room light, distance and the prior-light interval. Why: Display luminance and recent bright light strongly affect the result. Success check: The same history rule can be repeated. Accessible alternative: Complete the same research action — “Record display, brightness, room light, distance and the prior-light interval.” — using speech-to-text, text-to-speech, enlarged text, keyboard-only navigation, shorter work blocks or a support person. Preserve this declared check: “The same history rule can be repeated.” Do not convert the research task into capability practice. Alternative relationship: Target preserving when declared check is preserved Learner notes: ________________________________________________________________________________ Completed: [ ] ## 3. Learn the object set View clear versions of the allowed silhouettes and response labels. Why: The task should test visibility, not vocabulary. Success check: All clear objects are identified. Accessible alternative: Complete “View clear versions of the allowed silhouettes and response labels.” in shorter passes, or use keyboard input, dictation or a support person, while preserving this success check: “All clear objects are identified.” Use larger clear-training objects but keep test-panel geometry declared. Alternative relationship: Target preserving when declared check is preserved Learner notes: ________________________________________________________________________________ Completed: [ ] ## 4. Begin with visible panels Identify each object and confidence before checking, starting above the difficult level. Why: A visible start establishes the task without prolonged staring. Success check: The first panels are answered without strain. Accessible alternative: Complete the same research action — “Identify each object and confidence before checking, starting above the difficult level.” — using speech-to-text, text-to-speech, enlarged text, keyboard-only navigation, shorter work blocks or a support person. Preserve this declared check: “The first panels are answered without strain.” Do not convert the research task into capability practice. Alternative relationship: Target preserving when declared check is preserved Learner notes: ________________________________________________________________________________ Completed: [ ] ## 5. Step down one level Move through fixed brightness/contrast levels without changing display controls or leaning closer. Why: Manual adjustment destroys the physical comparison. Success check: Panel level and answer are recorded unchanged. Accessible alternative: A supported, seated, reduced-range or slower version of “Move through fixed brightness/contrast levels without changing display controls or leaning closer.” is equivalent only when it keeps the same trained or measured target, declared configuration and success check: “Panel level and answer are recorded unchanged.” If any of those change, record it as a related alternative rather than an equivalent repetition. Alternative relationship: Conditional equivalence requires target and configuration check Learner notes: ________________________________________________________________________________ Completed: [ ] ## 6. Stop rather than stare Use the declared viewing time and stop after repeated errors or symptoms. Why: Long staring and guessing do not create a valid dark-adaptation measure. Success check: The timer and error rule determine the endpoint. Accessible alternative: Complete “Use the declared viewing time and stop after repeated errors or symptoms.” in shorter passes, or use keyboard input, dictation or a support person, while preserving this success check: “The timer and error rule determine the endpoint.” Use larger clear-training objects but keep test-panel geometry declared. Alternative relationship: Target preserving when declared check is preserved Learner notes: ________________________________________________________________________________ Completed: [ ] ## 7. Retest after matched light history On another day, use novel silhouettes after the same prior-light interval. Why: Matched history and new items make the comparison less confounded. Success check: Prior light and configuration match within the declared tolerance. Accessible alternative: Complete “On another day, use novel silhouettes after the same prior-light interval.” in shorter passes, or use keyboard input, dictation or a support person, while preserving this success check: “Prior light and configuration match within the declared tolerance.” Use spoken or switch answers with no motor-speed score. Alternative relationship: Target preserving when declared check is preserved Learner notes: ________________________________________________________________________________ Completed: [ ] ## 8. Reset after a light interruption If a notification flash, bright display menu, window glare or room-light change occurs, stop the panel sequence. Restore the original settings, sit under the original room lamp for five minutes, then begin with a new panel rather than the interrupted one. Why: A brief bright exposure can alter temporary visibility and make the next low-level panel incomparable with earlier trials. Success check: The interruption, clock time and completed reset interval are logged, and the resumed item is unfamiliar. Accessible alternative: A supported, seated, reduced-range or slower version of “If a notification flash, bright display menu, window glare or room-light change occurs, stop the panel sequence. Restore the original settings, sit under the original room lamp for five minutes, then begin with a new panel rather than the interrupted one.” is equivalent only when it keeps the same trained or measured target, declared configuration and success check: “The interruption, clock time and completed reset interval are logged, and the resumed item is unfamiliar.” If any of those change, record it as a related alternative rather than an equivalent repetition. 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.