Which of the following instruments is used to record intraocular pressure?
A. Goniometer
B. Ophthalmoscope
C. Slit lamp
D. Tonometer
Correct Answer: D. Tonometer
A tonometer is a device used in glaucoma screening to record intraocular pressure. Instruments measuring intraocular pressure assume the eye is a closed globe with uniform pressure distributed throughout the anterior chamber and vitreous cavity. The normal range of intraocular pressure is 10 to 21 millimeters of mercury.
Option A: A goniometer measures joint movement and angles. A goniometer is a device that measures an angle or permits the rotation of an object to a definite position. In orthopedics, the former applies more. The art and science of measuring the joint ranges in each plane of the joint are called goniometry.
Option B: An ophthalmoscope examines the interior of the eye, especially the retina. The ophthalmoscope illuminates the retina through the normal iris defect that is the pupil. Light rays forming the image of the retina re-emerge through the pupil. The viewing aperture (window) of the ophthalmoscope contains a lens that modifies light rays to assist the user.
Option C: A slit-lamp evaluates structures in the anterior chamber in the eye. A slit lamp is a microscope with a bright light used during an eye exam. It gives the ophthalmologist a closer look at the different structures at the front of the eye and inside the eye. It’s a key tool in determining the health of the eyes and detecting eye disease.
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