The lens helps the eye to focus on images.
"The Lens. The lens is composed of transparent, flexible tissue and is located directly behind the iris and the pupil. It is the second part of your eye, after the cornea, that helps to focus light and images on your retina."
Answer: Depends on who it is.
Explanation: Expert male jumpers take about 20 strides, while female jumpers take about 16 strides. For the beginner, start with 8 strides. As you approach the jumping board, do not hesitate and slow down.
The double bubble sign on ultrasound is a sign for duodenal atresia which is associated with Down Syndrome.