What is the relative charge of the cornea in the corneal retinal potential?

The corneal retinal potential, also known as the corneal-retinal potential difference (CRP), refers to the electrical potential difference between the cornea and the retina. The cornea generally maintains a positive charge relative to the retina, which results in a net positive electrical potential. This positive charge arises due to the differences in ion distribution across the cellular membranes and the physiological characteristics of the tissues involved.

In terms of physiology, the cornea has a higher concentration of positive ions compared to the retina, which contributes to its positive charge. This electrical property is significant when measuring the corneal-retinal potential and can have implications for understanding various visual and neural processes.

While other choices may seem plausible, they do not accurately reflect the physiological phenomenon observed in the corneal retinal potential. The cornea's positive charge is a fundamental aspect of its role in the visual system, influencing aspects like light transmittance and neural signaling.