Letter charts are not only used to measure visual acuity, they are also used as targets for subjective refraction. This is the main reason distance acuity is measured more often than near acuity. At a long distance, accommodation is relaxed, so that the refraction can be more accurate.
Popliteal artery. The popliteal artery branches off from the femoral artery. It is located in the knee and the back of the leg. Its courses near the adductor canal and the adductor hiatus, distinctive open areas inside the thigh. At its far end, it splits into the anterior and posterior tibial arteries. During its course, the popliteal artery branches into other significant blood vessels.
The popliteal artery is located behind the knee in. the popliteal fossa and is a direct extension of the. superï¬cial femoral artery after it passes through. the adductor hiatus, an opening in the tendinous. slip of the great adductor muscle of the thigh. The. popliteal artery lies posterior to the femur and.