> For the complete documentation index, see [llms.txt](https://oculoris.gitbook.io/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://oculoris.gitbook.io/docs/science/accommodative-function.md).

# Accommodative Function

Accommodation is your eye's ability to shift focus between near and far — like a camera lens autofocusing. Prolonged near work fatigues the ciliary muscle, causing accommodative spasm and eye strain. Accommodative facility training directly targets this muscle, improving both speed and endurance.

#### Near & Far

*Near-far focus shifts — alternating between close and distant targets.*

* **(2006)** *Sterner B et al. — Acta Ophthalmologica Scandinavica* 4 weeks of accommodative training improved accommodative facility by 40% and reduced eye strain complaints by 56% in symptomatic computer users (RCT, N=54, p<0.01).

#### Focus Flip

*Lens flipper training — rapid accommodative switching between plus and minus lenses.*

* **(2019)** *CITT-ART Secondary Analysis — Optometry and Vision Science* Lens flipper training produced large effect sizes for accommodative amplitude gains (d=2.20) and accommodative facility improvements (d=1.87). Among the most effective accommodative interventions studied.

#### Chart Jump

*Hart Chart near-far rock — alternating focus between two charts at different distances.*

* **(2002)** *Gallaway M et al. — Optometry* Hart chart near-far rock significantly improved accommodative flexibility and reduced asthenopia in symptomatic computer users after 6 weeks of daily practice.