Textbook Question
Your friend tells you that she has just been diagnosed with myopia, and she wonders if staring at her computer screen too much might have caused her problem. What do you tell her?
370
views
15. The Special Senses
The Lens and Focusing Light on the Retina
Struggling with Anatomy & Physiology?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
What structure changes the shape of the lens to focus light for far and near vision?
A
Cornea
B
Ciliary muscle
C
Retina
D
Iris
Verified step by step guidance1
Identify the function of the lens in the eye, which is to focus light onto the retina for clear vision.
Understand that the lens changes shape to adjust focus for objects at different distances, a process known as accommodation.
Recognize that the ciliary muscle is responsible for changing the shape of the lens. When the ciliary muscle contracts, it allows the lens to become more rounded for near vision. When it relaxes, the lens flattens for far vision.
Differentiate the roles of other eye structures: the cornea helps to refract light but does not change shape, the retina is the light-sensitive layer where images are formed, and the iris controls the size of the pupil but does not affect lens shape.
Conclude that the ciliary muscle is the structure that changes the shape of the lens to focus light for both far and near vision.
6:29mWatch next
Master Optics: Lenses and Refraction with a bite sized video explanation from Bruce Bryan
Start learningRelated Videos
Related Practice
The Lens and Focusing Light on the Retina practice set
Problem sets built by lead tutorsExpert video explanations