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An important characteristic of glaucoma, an eye disease, is the presence of classical visual field loss. Tonometry is a common form of glaucoma screening, whereas, for example, an eye is classified as positive if it has an intraocular pressure of 21 mmHg or higher at a single reading. Given the data shown in Table E1.28, calculate the sensitivity and specificity of this screening test.

Field Loss	Test Result		Total
	Positive	Negative
Yes	13	7	20
No	413	4567	4980

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