Practise one harmless line-tilt discrimination and test its narrow transfer

Reset: Re-read this authored instruction — “Record line angle/length, contrast, card distance, lighting, both-eye use and usual correction.” — and its success check, then attempt only this step.

1. Possible snag: Viewing distance drifts during 'Lock the visual fixture' in perceptual learning.

   Correction: Use a table marker and keep the head at the declared position.

Stop / get help: Stop and seek urgent eye care for sudden vision loss, a curtain/shadow, new flashes/floaters with vision change, severe eye pain or acute neurological symptoms.

Reset: Re-read this authored instruction — “For two obvious sample cards, say LEFT when the top leans left and RIGHT when it leans right; do not rotate the card.” — and its success check, then attempt only this step.

1. Possible snag: Cards are rotated while answering.

   Correction: Place a fixed top mark and reject rotated trials.

Stop / get help: Stop and seek urgent eye care for sudden vision loss, a curtain/shadow, new flashes/floaters with vision change, severe eye pain or acute neurological symptoms.

Reset: Re-read this authored instruction — “Classify 20 shuffled cards one at a time, recording response and time; do not reveal the answer until the block ends.” — and its success check, then attempt only this step.

1. Possible snag: Feedback leaks into baseline during 'Measure baseline without feedback' in perceptual learning.

   Correction: Hide the key until the full baseline block ends.

Stop / get help: Stop and seek urgent eye care for sudden vision loss, a curtain/shadow, new flashes/floaters with vision change, severe eye pain or acute neurological symptoms.

Reset: Re-read this authored instruction — “Complete two 10-card blocks. After each response, check the key, state correct/incorrect and view the correct orientation for one second.” — and its success check, then attempt only this step.

1. Possible snag: The result from “Complete two 10-card blocks. After each response, check the key, state correct/incorrect and view the correct orientation for one second.” does not yet meet this declared check: Every practice response receives the same feedback.

   Correction: Return to the start of “Practise in short feedback blocks”, reduce complexity or pace, and repeat only the part needed to satisfy: “Every practice response receives the same feedback.”

Stop / get help: Stop and seek urgent eye care for sudden vision loss, a curtain/shadow, new flashes/floaters with vision change, severe eye pain or acute neurological symptoms.

Reset: Re-read this authored instruction — “Look away at a distant comfortable target and rest for two minutes between blocks; stop for strain or visual symptoms.” — and its success check, then attempt only this step.

1. Possible snag: The learner trains through eye strain.

   Correction: Stop, rest and seek eye care for new/persistent symptoms.

Stop / get help: Stop and seek urgent eye care for sudden vision loss, a curtain/shadow, new flashes/floaters with vision change, severe eye pain or acute neurological symptoms.

Reset: Re-read this authored instruction — “After at least 10 minutes doing a non-visual or comfortable neutral task, classify 20 matched cards without feedback under the original setup.” — and its success check, then attempt only this step.

1. Possible snag: The result from “After at least 10 minutes doing a non-visual or comfortable neutral task, classify 20 matched cards without feedback under the original setup.” does not yet meet this declared check: Conditions and scoring match baseline; the visible 'Run a delayed matched test' check is satisfied.

   Correction: Return to the start of “Run a delayed matched test”, reduce complexity or pace, and repeat only the part needed to satisfy: “Conditions and scoring match baseline; the visible 'Run a delayed matched test' check is satisfied.”

Stop / get help: Stop and seek urgent eye care for sudden vision loss, a curtain/shadow, new flashes/floaters with vision change, severe eye pain or acute neurological symptoms.

Reset: Re-read this authored instruction — “Use the new line-length set with the same tilt, contrast, distance and response rule. Report it separately.” — and its success check, then attempt only this step.

1. Possible snag: The result from “Use the new line-length set with the same tilt, contrast, distance and response rule. Report it separately.” does not yet meet this declared check: No other feature changes; the visible 'Test narrow transfer' check is satisfied.

   Correction: Return to the start of “Test narrow transfer”, reduce complexity or pace, and repeat only the part needed to satisfy: “No other feature changes; the visible 'Test narrow transfer' check is satisfied.”

Stop / get help: Stop and seek urgent eye care for sudden vision loss, a curtain/shadow, new flashes/floaters with vision change, severe eye pain or acute neurological symptoms.

Reset: Re-read this authored instruction — “Compare accuracy and median response time, check left/right bias and strain. Call improvement task-specific unless the new set also improves.” — and its success check, then attempt only this step.

1. Possible snag: Only overall accuracy is checked.

   Correction: Report left/right errors separately to reveal response bias.

Stop / get help: Stop and seek urgent eye care for sudden vision loss, a curtain/shadow, new flashes/floaters with vision change, severe eye pain or acute neurological symptoms.