In a stretch of level pasture at the western foot of a low spur of land in County Kildare, a small dry stone enclosure shelters a spring well that people have visited for centuries in the hope of curing pains and sore eyes. The structure is modest, almost easy to overlook: roughly rectangular, partially roofed, measuring about 3.4 metres along its longer axis and 1.4 metres wide, built without mortar in the traditional dry stone manner. That such an unassuming construction should draw visitors at all says something about the durability of local belief attached to particular water sources in Ireland.

The well is associated with a Pattern, which is the Irish term for a patron saint's day gathering, combining prayer, ritual circumambulation, and often social occasion at a sacred site. At Killashee, the Pattern falls on the 17th of March, St Patrick's Day, a date that suggests a long-standing connection between this spring and early Christian devotion in the area. That connection is given some physical weight by the presence of a possible Early Ecclesiastical site approximately 350 metres to the west, indicating that this corner of Kildare may have supported a small religious community in the early medieval period. The curative reputation of the water, particularly for eye complaints, follows a pattern common to holy wells across Ireland, where specific ailments were traditionally matched to specific sites, with the healing properties often attributed to the intercession of a local saint.