"The light of the body is the eye: if therefore thine eye be single, thy whole body shall be full of light." Matt 6:22
This photo is a good example of only being able to focus on one thing at a time and read more for how Science and Health explains more about what Jesus said about healing yourself.
Mary Baker Eddy says on P14 of her book Science and Health
"Become conscious for a single moment that Life and intelligence are purely spiritual, — neither in nor of Spiritualized consciousness matter, — and the body will then utter no complaints. If suffering from a belief in sickness, you will find yourself suddenly well. Sorrow is turned into joy when the body is controlled by spiritual Life, Truth, and Love. Hence the hope of the promise Jesus bestows:
“He that believeth on me, the works that I do shall he do also; . . . because I go unto my Father,” — [because the Ego is absent from the body, and present with Truth and Love.] The Lord’s Prayer is the prayer of Soul, not of material sense."