Jaeger cards, also known as Jaeger reading charts or Jaeger eye charts, are a standardized testing tool used to measure visual acuity or sharpness of vision. The chart consists of a series of progressively smaller letters or symbols arranged in rows.
The test is named after German ophthalmologist, Eduard Jaeger, who first developed the chart in the late 1800s. The Jaeger chart measures near vision and is commonly used by optometrists and ophthalmologists in the United States.
The Jaeger card measures visual acuity at a distance of about 30 cm. The first line on the chart is usually labeled as J1, indicating that the letters on that line are the easiest to read. The smallest line on the chart is labeled as J10, which represents the most difficult level of visual acuity.
Jaeger cards may be used to evaluate and monitor vision changes caused by certain eye conditions, such as cataracts, age-related macular degeneration, or glaucoma. They can also be used to assess the effectiveness of prescription lenses, particularly for reading glasses or bifocals.
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