The blind spot is known as:

Appeared in: DSSSB 13 August 2024

Explanation

The blind spot is the common term for the optic disc.
The optic disc is the point on the retina where the ganglion cell axons leave the eye to form the optic nerve.
This area is devoid of photoreceptor cells (both rods and cones), making it insensitive to light.
Because no light can be detected in this specific area, it creates a natural blind spot in the visual field of each eye.

Option A: The macula lutea is responsible for high-acuity central vision, which is the opposite of a blind spot. It is rich in photoreceptors.
Option C: Fovea ovalis is not a standard anatomical term used in ophthalmology. It is likely a distractor created by combining 'fovea' (from the eye) and 'fossa ovalis' (a structure in the heart).
Option D: The fovea centralis is a small depression within the macula that provides the sharpest vision of all. It has the highest concentration of cone cells.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Anatomy of the retina and the physiological blind spot as background academic context rather than a clinical decision trigger.
Examining the optic disc is a fundamental part of an ophthalmoscopic examination to assess the health of the optic nerve and check for signs of disease.
Swelling of the optic disc (papilledema) is a critical sign of increased intracranial pressure, which can be caused by conditions like brain tumors, hydrocephalus, or severe hypertension, requiring urgent medical evaluation.
What if? If a patient reports a new, enlarging, or changing blind spot (a pathological scotoma) that is not the physiological blind spot, it could indicate a serious condition like a retinal detachment, macular degeneration, or a stroke affecting the visual pathway, requiring immediate ophthalmologic consultation.

How to Approach the Question

The question asks to identify the anatomical term for the 'blind spot'.
Recall the basic anatomy of the retina and the path of the optic nerve.
Understand that the 'blind spot' is a physiological phenomenon caused by a lack of light-detecting cells in a specific area.
This area is where the optic nerve fibers bundle together and exit the eye, leaving no room for photoreceptors (rods and cones).
Evaluate the options: Macula and fovea are associated with sharp central vision. 'Fovea ovalis' is not a real anatomical term for the eye.
Conclude that the optic disc is the correct anatomical structure corresponding to the physiological blind spot.

Concept Tested & Keywords

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Practise the full DSSSB 13 August 2024

Attempt every question from this paper in a timed mock, then review the full solution for each one.