How would the absence of the enzyme photodiesterase PDE) affect vision in the vertebrate eye?

Question

Quizplus · Accepted Answer

Without photodiesterase (PDE), the levels of cGMP in the rod cells would remain elevated, keeping the cGMP-gated sodium channels open. This would lead to continuous glutamate discharge at the synapse between the rod cells and bipolar cells, resulting in a lack of discrimination between light and dark. As a consequence, the brain would not be able to detect light absorbed by the rod cells.

How Would the Absence of the Enzyme Photodiesterase PDE) Affect