A 74-Year-Old Patient Has Bifocals Prescribed to Correct Myopia and Presbyopia

question 24

Multiple Choice

A 74-year-old patient has bifocals prescribed to correct myopia and presbyopia. To evaluate the effectiveness of the lenses, the nurse working in the eye clinic will check the patient for

• A) cloudiness in the eye lenses.
• B) intraocular pressure changes.
• C) strength of the eye muscles.
• D) both near and distant vision.

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Definitions:

Firing Rate

The frequency at which a neuron discharges electrical impulses over a certain period of time.

Absolute Refractory Period

The period immediately following an action potential during which a neuron is completely unable to fire another action potential, regardless of the strength of the stimulus.

Action Potential

A temporary inversion of the electrical potential across the membrane of a nerve or muscle cell, allowing for the transmission of signals.

Hebbian Learning

Hebbian learning is a theory in neuroscience that proposes an increase in synaptic efficacy arises from the presynaptic cell's repeated and persistent stimulation of the postsynaptic cell, foundational for understanding the adaptation of the brain during learning.