Blind spot is known as?

DSSSB Public Health Nurse - 2015

Applied Anatomy

Easy

Appeared in: DSSSB Public Health Nurse - 2015

Explanation

The blind spot of the eye is anatomically known as the optic disc.
This specific area on the retina is where the optic nerve fibers exit the back of the eye to transmit visual information to the brain.
Crucially, the optic disc contains no photoreceptor cells (rods or cones), which are the cells responsible for detecting light and color.
The absence of these light-detecting cells means that any light falling on this spot cannot be seen, creating a 'blind spot' in the visual field of each eye.

Option A: The macula lutea is the area of the retina responsible for sharp, detailed central vision (visual acuity). It has a high concentration of cone cells and is the functional opposite of a blind spot.
Option C: The fovea centralis is a small pit in the center of the macula that contains the highest concentration of cone cells. It is the point of sharpest and most detailed vision, not a blind spot.
Option D: This option is incorrect because there is a correct answer among the choices. The optic disc is the correct term for the blind spot.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Anatomy and Physiology of the Eye as background academic context rather than a clinical decision trigger.
Understanding the physiological blind spot is crucial for nurses when assisting with or interpreting visual field tests (perimetry). The test maps the patient's visual field, and a normal result will always show a blind spot corresponding to the optic disc.
An enlarged blind spot or the presence of new blind spots (scotomas) can be a sign of serious conditions like glaucoma (due to optic nerve damage), optic neuritis, or other neurological and retinal diseases, requiring prompt referral and intervention.
What if? If a patient complains of a new, noticeable 'blind spot' or 'dark spot' in their central vision, the nurse should suspect a pathological cause affecting the macula (like macular degeneration) rather than the physiological blind spot, and this requires urgent ophthalmological evaluation.

How to Approach the Question

First, identify the core concept of the question, which is a specific anatomical feature of the eye: the 'blind spot'.
This is a factual recall question. Access your knowledge of eye anatomy.
Evaluate each option based on its known function. Recall that the blind spot is defined by a lack of photoreceptors.
Option A, Macula lutea, is for sharp vision (many photoreceptors). Eliminate it.
Option C, Fovea centralis, is for the sharpest vision (most photoreceptors). Eliminate it.
Option B, Optic disc, is where the optic nerve exits and has no photoreceptors. This matches the definition of a blind spot.

Concept Tested & Keywords

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