## Core Concept
Jaeger's chart is a tool used in ophthalmology to measure visual acuity, specifically for near vision. It consists of a series of printed charts with text of varying sizes, allowing for the assessment of a patient's ability to read and see objects up close.

## Why the Correct Answer is Right
The correct answer, , is related to the measurement of near visual acuity. Jaeger's charts are specifically designed to assess a patient's near vision, which is essential for daily activities such as reading. The charts provide a standardized way to measure near visual acuity, and the results can help diagnose and manage conditions affecting near vision.

## Why Each Wrong Option is Incorrect
* **Option A:** - This option is incorrect because Snellen's chart, not Jaeger's chart, is used to measure distance visual acuity.
* **Option B:** - This option is incorrect because, although related to vision, the measurement of intraocular pressure is done using a tonometer, not Jaeger's chart.
* **Option D:** - This option is incorrect because the measurement of visual fields is done using a perimeter or a confrontation visual field test, not Jaeger's chart.

## Clinical Pearl / High-Yield Fact
A key point to remember is that Jaeger's charts are used for assessing near visual acuity, and the results are often expressed in terms of the smallest print size that can be read comfortably. This is an important distinction from Snellen's chart, which measures distance visual acuity.

## Correct Answer: C. near vision.