What controls the shape of the lens?Multiple Choiceciliary musclecorneairispupilfovea centralis

Answer Breakdown

1. Identifying Key Terms: The question asks about what specifically controls the shape of the lens in the eye.

2. Options Given:

   • Ciliary muscle
   • Cornea
   • Iris
   • Pupil
   • Fovea centralis

3. Relevant Anatomy:

   • The ciliary muscle is responsible for changing the shape of the lens through its contraction and relaxation, allowing for accommodation (focusing on objects at various distances).

4. Analysis of Options:

   • Cornea: It helps to focus light but does not control lens shape.
   • Iris: It controls the amount of light entering the eye but does not change lens shape.
   • Pupil: It is the opening controlled by the iris for regulating light intake.
   • Fovea centralis: It is the area of sharpest vision but does not relate to lens shape control.

Final Answer

The correct answer is ciliary muscle. It controls the shape of the lens in the eye, enabling proper focusing ability.