Examlex
Which is not a level of a data flow diagram?
Tonometer
An instrument for determining pressure or tension, especially determining ocular tension.
Retinoscope
An instrument used by eye doctors to shine a light into the patient's eye to observe the reflection from the retina, helping to determine the patient's prescription for glasses or contact lenses.
Ophthalmoscope
A hand-held instrument with a light; used to view inner eye structures.
Slitlamp
A microscope combined with a bright light used to examine the eye's anterior and posterior segments, aiding in detecting eye diseases.
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