Tonic Accommodation

Tonic accommodation refers to the eye's baseline adjustment of the crystalline lens to maintain clear vision at a particular distance, usually for a resting or relaxed state. It involves a subtle, continuous tension of the ciliary muscles and lens shape, allowing the eye to stay focused without effort. This constant, low-level state of accommodation ensures the eye remains ready to quickly adapt to changes in distance, especially for near vision. Think of it as the eye's default focus setting, maintaining clarity without active effort.