What is the primary function of the lens of the eye?

• A. To produce tears for eye lubrication
• B. To focus light onto the retina
• C. To protect the eye from external debris
• D. To detect color and light intensity

Answer: (B)

Verified step by step guidance

1. Understand the anatomy of the eye: The eye is composed of several parts, including the cornea, lens, retina, and optic nerve. Each part has a specific function in the process of vision.
2. Identify the role of the lens: The lens is a transparent, flexible structure located behind the iris and pupil. It is responsible for focusing light onto the retina.
3. Explain how the lens focuses light: The lens changes shape to adjust the focal distance, a process known as accommodation. This allows the eye to focus on objects at various distances.
4. Differentiate the lens from other eye structures: Unlike the cornea, which also helps focus light, the lens can change shape to fine-tune focus. The retina, on the other hand, is responsible for detecting light and converting it into neural signals.
5. Conclude the primary function: The primary function of the lens is to focus light onto the retina, enabling clear vision. This is distinct from other functions like tear production or protection from debris, which are performed by other parts of the eye.