In Below given image test is used for-

Appeared in: SJH Nursing Officer - 2019

Explanation

The image displays a Snellen chart, which is the standard tool for assessing distance visual acuity, commonly known as far vision.
The test procedure involves having the patient stand at a standardized distance of 20 feet (6.1 meters) from the chart.
The patient is asked to read the smallest line of letters possible, first with both eyes and then with each eye individually.
A result of 20/20 is considered normal vision, indicating the patient can clearly see at 20 feet what a person with normal eyesight can see at that distance.

Option A: Peripheral vision, or side vision, is not tested with a Snellen chart. It assesses the full horizontal and vertical range of what a person can see.
Option B: Near vision is the ability to see objects up close. A Snellen chart is designed for distance and would not accurately measure this.
Option D: Color blindness, or color vision deficiency, is the inability to distinguish between certain colors. A Snellen chart only uses black letters on a white background.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Visual Acuity Assessment as background academic context rather than a clinical decision trigger.
Assessing visual acuity is a fundamental nursing skill used during health screenings, pre-operative assessments, and for monitoring conditions like diabetes or hypertension that can affect vision.
A baseline vision assessment helps identify patients who may need assistance with mobility, reading medication labels, or understanding written instructions, thus preventing errors and falls.
What if? - If a patient cannot read even the largest letter on the Snellen chart (the 20/200 line), the nurse should then assess their ability to count fingers, detect hand motion, or perceive light, documenting the finding and referring for an urgent ophthalmology consultation.

How to Approach the Question

First, identify the object shown in the image. Recognize it as a Snellen chart, characterized by rows of letters that decrease in size.
Recall the primary purpose of a Snellen chart from your nursing knowledge. It is the standard method for measuring how well a person sees at a distance.
Scan the given options to find the one that matches this purpose. 'For Far Vision' is the correct medical term for testing distance vision.
Confirm your choice by mentally eliminating the other options. Recall that peripheral vision is checked with the confrontation test, near vision with a Jaeger card, and color blindness with Ishihara plates.

Concept Tested & Keywords

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

E6 Nelson Textbook of Pediatrics(2024) — Volume 2 p. 1716-1718

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