PWR-066 · Visual Perception & Search

Contrast sensitivity

Contrast sensitivity can be trained in some clinical settings, but a better test threshold is not generally enhanced vision.

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One source of teaching truth

Canonical Power learning unit · TLU-PWR-066

The learner completes two novel contrast ladders and reports correct orientation by level, false guesses, configuration and symptoms.

Canonical Power page
PWR-066 · Contrast sensitivity
Full tutorial
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Practical authority
The tutorial teaches a low-risk method that may be practised inside its stated limits.
Current treatment
Full low-stakes tutorial
Research depth
deep · 6 bound sources
Risk framing
low to moderate; clinical when visual disorder or prism
Capability self-practice
Permitted inside the tutorial's stated low-risk limits
Pathway membership
G-CUR-006

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Explanation is not permission.

This dossier explains the evidence and its limits. It is not a diagnosis, personal recommendation, assessment, clearance, performance promise or training programme. Actionable teaching appears only when the canonical Power record explicitly authorises it.

Complete bounded explanation

What this power means.

Capability to develop or express contrast sensitivity in a declared context without inheriting broader claims.

What the current evidence supports

Defined contrast-sensitivity measures can improve with perceptual learning in selected amblyopic populations; transfer beyond related visual tests is incomplete.

How to observe or measure it without overclaiming

Record a full contrast-sensitivity function or validated bounded threshold at declared luminance and correction; do not substitute chart acuity or subjective sharpness.

Myth

See every hidden detail

Metric

Contrast-sensitivity function by spatial frequency and luminance

Boundary

A trained threshold does not confer night vision, field expansion or universal object recognition.

Negative and limiting findings

  • Clinical improvements do not establish enhancement in healthy eyes.
  • Fluoxetine offered no added benefit over placebo in the reviewed visual-learning trial.

Claims this evidence cannot support

  • See through darkness
  • Make every visual task sharper
  • Repair the retina by gaming
  • Biohack contrast with prescription drugs

Individual tutorial · FULL SELF GUIDED TUTORIAL

How to learn this Power now.

The learner completes two novel contrast ladders and reports correct orientation by level, false guesses, configuration and symptoms.

  1. Get readySet comfortable room light and eliminate screen glare.
  2. Learn the method8 concrete steps teach the permitted method from start to finish.
  3. See right and wrong6 comparisons show correct or safer execution beside common wrong or riskier choices.
  4. PractisePractise one short ladder on up to two days per week. Use new orders and hold the display constant. Progress means reliable novel-item accuracy, not lower contrast at any cost.
  5. Check progressRecord correct/incorrect orientation and confidence by contrast level, plus display, luminance setting, distance and symptoms. Report catch-trial accuracy and response counts for each orientation so an orientation-key bias is visible.

Authority boundary: Titan teaches a concrete low-stakes method step by step while keeping evidence and transfer claims bounded. The method is Power-specific; its actionability follows this treatment.

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Related Powers: PWR-065 · PWR-067 · PWR-068 · PWR-069

Direct evidence register

Sources that support—and limit—the claim.

Citation roles are explicit. A source may support existence or trainability while simultaneously limiting transfer, certainty, generalisation or safety.

  1. Primary empirical supportLimiting / contrary
    Perceptual learning improves contrast sensitivity and visual acuity in adults with anisometropic amblyopia

    Y. Zhou; C. Huang; P. Xu; L. Tao; Z. Qiu; X. Li; Z.-L. Lu · 2006 · Primary research

  2. Primary empirical supportLimiting / contrary
    Fluoxetine does not enhance the effect of perceptual learning on visual function in adults with amblyopia

    H. J. Huttunen; J. M. Palva; L. Lindberg; S. Palva; V. Saarela; E. Karvonen; M.-L. Latvala; J. Liinamaa; S. Booms; E. Castrén; H. Uusitalo · 2018 · Primary research

  3. Primary empirical supportLimiting / contrary
    Improving vision in adult amblyopia by perceptual learning

    U. Polat; T. Ma-Naim; M. Belkin; D. Sagi · 2004 · Primary research

  4. Primary empirical supportLimiting / contrary
    Randomised trial of three treatments for amblyopia: Vision therapy and patching, perceptual learning and patching alone

    R. Hernández-Andrés; M. Á. Serrano; A. Alacreu-Crespo; M. J. Luque · 2025 · Primary research

  5. Primary empirical supportLimiting / contrary
    Training in contrast detection improves motion perception of sinewave gratings in amblyopia

    F. Hou; C.-B. Huang; L. Tao; L. Feng; Y. Zhou; Z.-L. Lu · 2011 · Primary research

  6. Primary empirical supportLimiting / contrary
    Perceptual learning improves contrast sensitivity, visual acuity, and foveal crowding in amblyopia

    M. Barollo; G. Contemori; L. Battaglini; A. Pavan; C. Casco · 2017 · Primary research

Current teaching and evidence boundary

The next gate remains visible.

External confirmation is required before higher-authority use because: a clinical, high-risk or regulated configuration; a supervision or non-attempt boundary.

A Power-specific tutorial is available at /tutorials/pwr-066/. It contains a plain-English method, 8 ordered steps, a worked example, right-versus-wrong comparisons, specific mistakes and corrections, practice, measurement, accessibility, stopping rules and evidence. Its self guided mode remains controlling.