A nurse is preparing the client for an electrocardiogram (ECG). The client asks the nurse what is an electrocardiogram.
Which is the best description for an electrocardiogram?

Choice A rationale

Glaucoma is characterized by increased intraocular pressure that can lead to optic nerve damage and peripheral vision loss. It does not typically cause central vision loss or the presence of a large black spot in the center of vision.

Choice B rationale

A detached retina often causes the sudden appearance of floaters or flashes of light, and a shadow or curtain effect in the peripheral vision. It does not typically present as a black spot in the center of vision.

Choice C rationale

Macular degeneration is an age-related condition that affects the central part of the retina (macula). It leads to central vision loss, which can manifest as a black or dark spot in the center of vision. This condition progressively impairs the ability to see fine details and perform activities like reading or recognizing faces.

Choice D rationale

Diabetic retinopathy is a complication of diabetes that affects the blood vessels in the retina. It can cause vision changes, such as floaters or blurred vision, but it does not typically present as a large black spot in the center of vision.

Choice A rationale

Without treatment, glaucoma can lead to blindness due to the progressive damage it causes to the optic nerve. Elevated intraocular pressure damages the optic nerve fibers, leading to peripheral vision loss and eventually total blindness if untreated.

Choice B rationale

Double vision is not a common symptom of glaucoma. Instead, glaucoma typically presents with symptoms like gradual peripheral vision loss, eye pain, and halos around lights.

Choice C rationale

Glaucoma is primarily caused by increased intraocular pressure, either due to overproduction of aqueous humor or improper drainage, not inadequate fluid production.

Choice D rationale

Use of eye drops helps to control intraocular pressure but does not improve vision; it helps to prevent further damage to the optic nerve.