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Vision training · 2–10 min

Convergence & near-far focus trainer.

Two short exercises for eye-teaming and focus flexibility: a target that shifts near and far, and two dots that drift apart for you to fuse into one. Pick a duration and pace, then start.

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E

Press Space or tap "I see it" the instant the letter changes.

Accuracy: —

Clinical background

The science behind this

Comfortable near vision needs two systems working together. Accommodation is the ciliary muscle reshaping the lens to focus up close; vergence is the eyes rotating inward (convergence) so both foveas stay on the same target. The two are neurally coupled — focusing drives some convergence automatically.

The near-far task trains accommodative facility (how quickly you can change focus), while the two-dot fusion task trains fusional vergence (holding a single image as demand increases). Convergence insufficiency — difficulty sustaining convergence at near — is a common, treatable cause of eye strain and blur while reading.

Evidence & context

  • Office-based vergence and accommodative therapy has clinical support for convergence insufficiency (e.g., the CITT trial)
  • These skills underlie reading stamina and near-work comfort

Limitations

  • This is practice, not treatment; a true binocular-vision disorder needs diagnosis and a supervised program.
  • Stop if you get pain, a headache, or double vision that won't clear.