Physiology of Refractive Media in the Eye

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Questions and Answers

What percentage of glucose is metabolized anaerobically by the glycolytic pathway in the lens?

80% (correct)

60%

90%

95%

What is the primary function of the sorbitol pathway in the lens?

Antioxidant mechanism

Role in diabetic cataract (correct)

Kreb's cycle

Glycolytic pathway

What is the respiratory quotient of the lens?

1 (correct)

0.5

1.5

What is the term for the conversion of light energy into a nerve impulse in the visual process?

Phototransduction Signup and view all the answers

Which enzyme is NOT involved in the preventive antioxidant mechanism of the lens?

Lactase Signup and view all the answers

What is the number of ganglion cells in each eye?

1.5 million Signup and view all the answers

What is the main reason for corneal transparency?

Peculiar arrangement of corneal lamellae Signup and view all the answers

What is the source of oxygen for the cornea?

Air through tear film Signup and view all the answers

What is the respiratory quotient of the cornea?

1 Signup and view all the answers

What helps maintain lens transparency?

All of the above Signup and view all the answers

What is the function of aquaporin-0 in the lens?

Maintenance of lens transparency Signup and view all the answers

Which layer of the cornea is metabolically more active?

Epithelium Signup and view all the answers