Please choose the correct ending to complete the given sentence: Health: [header] How to rehab vision post stroke [title] Try the pencil exercise. [step] Some partial vision loss due to stroke may be reversed by retraining the brain through vigorous eye exercises. These exercises are now becoming a routine part of physical therapy.

Ending1: The following exercise may be helpful in improving vision after stroke. [substeps] Hold a pencil or anything similar in front of the patient's eyes at a distance of 18 inches (45.7 cm). Ending2: With a little practice, they should be sufficiently comprehensive to help your vision function. [substeps] For your pencil exercise, sit on a mat or chair with a solid object in front of you like a book or a pocket watch to stay calm. Ending3: They can be helpful about lengthening your vision, as they can be fluid exercises that allow you to penetrate the set of cloudy eye lenses that would usually be cut out with a sharp knife. To start, sit with your legs in front of you and your arms outstretched in front of you. Ending4: Research shows that they work to the better health of the brain than type 1 vision. [substeps] With a pencil exercise, you stand directly in front of a mirror.

Answer format: ending1/ending2/ending3/ending4