I thought before I did this search I’d find fewer species. I guessed wrong.
The follow plant species have eye improving properties and have little or no harmful properties to us; most have none.
Referring from Peterson Field Guides: Eastern/Central Medicinal Plants and Herbs□ Foamflower “Tiarella cordifolia “Saxifrage Family†“[used to treat or cure] eye ailment†‘rich woods
□ Eyebright “WARNING: experimentally, may induce side effects, including dim vision. Avoid use without physicians’s advice.
â–¡ Narrow-Leaved Plantain
□ heal-all, self-heal “whole plant†[used]
□ Caroline Allspice “cold Tea used as eye drops for failing sight.†“WARNING: Grazing cattle have been reported to have a toxic reaction to eating this plant.
â–¡ Witch-Hazel “Hamamelis virginianaâ€Â
â–¡ White Mulberry “Morus alba†“Fruits eaten for blood deficiency, to IMPROVE VISION and circulation, and for diabetes.â€Â
Referring from Peterson Field Guides: Western Medicinal Plants and Herbs
â–¡ miner’s lettuce “improve visionâ€Â
â–¡ Eye Bright “WARNING: Avoid use without a qualified health practitioner’s advice†“…other Euphrasia species have been used similarly and interchangeably.â€Â
â–¡ Mountain Sweet Cicely “[treats or cures] eye problems “WARNING: Do not confuse with Poison Hemlock (Conium); see p.60.â€Â
â–¡ Western Sweet Cicely “Osmorhiza occidentalisâ€Â
â–¡ Self-Heal, Heal-All “Prunella vulgaris L.†“Mint Family†“WARNING: Avoid use during pregnancy.â€Â
â–¡ Plantago major “Plantain Familyâ€Â“
â–¡ “Bark tea of Sweetshrub, Calycanthus floridus., was used for hives and urinary tract disorders and as an eye medicine for people who were losing their sight.†“WARNING: Grazing cattle have been reported to have a toxic reaction to eating this plant.†“[use] barkâ€Â
â–¡ Broom Snakeweed “Gutierrezia sarothra†Composite Familyâ€Â
â–¡ White Mulberry “small tree†“Morus alba†“…improve vision and circulation…â€Â
â–¡ Cattail
Referring from Wild Medicinal Plants by Schneider
â–¡ blue berry
â–¡ celandine
â–¡ chamomile
â–¡ cinquefoil
â–¡ common speedwell
â–¡ eye bright
â–¡ mallow
â–¡ mugwort
â–¡ raspberry
Referring from Edible & Medicinal Plants of the Rockies
â–¡ Heath Family, Blueberry “leaves contain moderately high concentrations of tannins.â€Â
â–¡ Heath Family, Low Bilberry “contain anthocyanosides, which are said to improve night-vision.â€Â
I’ve stopped the search here for now…