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Snellen chart is used to estimate visual acuity (last three rows are 20/15, 20/13 and 20/10) A Snellen chart is an eye chart that can be used to measure visual acuity. Snellen charts are named after the Dutch ophthalmologist Herman Snellen who developed the chart in 1862 as a measurement tool for the acuity formula developed by his professor ...
A dermatome is a distinct area of your skin defined by its connection to one of 30 spinal nerves. We’ll explore more about both your spinal nerves and dermatomes, including a chart showing each ...
The spinal cord, like the brain, has two major layers of protection. First are the vertebrae of the spine, and underneath those are three layers of tough membrane called the meninges. The meninges ...
Let’s say that you check your blood sugar before a meal and it’s 170. You’ll need 1 unit of fast-acting insulin to adjust to your target of 120. If you plan to eat a meal that has 60 grams ...
A1c Levels. For people without diabetes, the normal range for the hemoglobin A1c level is between 4% and 5.6%. Hemoglobin A1c levels in the range of 5.7%-6.4% mean you have prediabetes and a ...
An eye chart is a chart used to measure visual acuity comprising lines of optotypes in ranges of sizes. Optotypes are the letters or symbols shown on an eye chart. [1] Eye charts are often used by health care professionals, such as optometrists , physicians and nurses , to screen persons for vision impairment .
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