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biological

Judged: two independent readers; copy check clear.

convergence

convergence Convergence is the position or movement of the two eyes’ lines of regard so that they meet at one fixation point.

Convergence is the position or movement of the two eyes’ lines of regard so that they meet at one fixation point. In eye movements, this refers especially to turning the eyes inward so they intersect at a point in front of the eyes, such as when shifting focus from something farther away to something nearer.