Peripheral vision is assessed by?

Appeared in: DSSSB Public Health Nurse - 2015

Explanation

The confrontation test is a manual method used to screen and assess a patient's peripheral visual field.
It works by comparing the patient's peripheral vision directly to that of the examiner, who is assumed to have normal visual fields.
During the test, the examiner presents a target (like a finger) from the periphery and notes when the patient first sees it, helping to map out the boundaries of the visual field.
This method is a fundamental clinical skill for detecting visual field defects at the bedside.

Option A: The Snellen chart is designed to measure central visual acuity, which is the ability to see fine details clearly at a specific distance.
Option B: The Ishihara chart contains plates with colored dots used to identify numbers or patterns, specifically for screening for color vision deficiencies.
Option C: A slit lamp is a binocular microscope used for a detailed, magnified examination of the anterior (front) and posterior (back) segments of the eye.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Assessment of Peripheral Vision as background academic context rather than a clinical decision trigger.
Assessing peripheral vision is a crucial nursing skill for screening patients for neurological or ophthalmological conditions.
Defects in the peripheral visual field (scotomas) can be an early sign of serious conditions like glaucoma, retinal detachment, or brain lesions (e.g., tumors, stroke).
What if? If a patient reports 'tunnel vision' but has 20/20 acuity on a Snellen chart, the priority is to perform a confrontation test. This symptom specifically points to a loss of peripheral vision, which the Snellen test would completely miss.

How to Approach the Question

First, identify the key concept in the question: 'Peripheral vision.' Understand this refers to side vision, not the sharp, central vision used for reading.
Next, evaluate each option based on its specific purpose in an eye assessment.
Eliminate the Snellen chart, as it tests central acuity by having the patient read letters.
Eliminate the Ishihara chart, as it tests color perception using colored dot patterns.
Eliminate the slit lamp, as it is a piece of equipment for microscopic examination of eye structures, not a test of visual function.
This process of elimination leaves the Confrontation test, which is the standard bedside screening method for peripheral vision.

Concept Tested & Keywords

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E6 Medicine Harrison 22e Part 1 p. 262-264

E6 Nursing Fundamentals Taylor p. 390-392

E6 Nursing Fundamentals Potter Perry 12e Part 3 p. 78-80

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