Use ray cast
var ray = Camera.main.ScreenPointToRay(new Vector3(Screen.width * 0.5f, Screen.height * 0.5f, 0));
var hits = Physics.SphereCastAll(ray, 0.25f, 50, m_ImpactLayers, QueryTriggerInteraction.Ignore);
if (hits != null && hits.Length > 0)
{...