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A medical halogen penlight to observe pupillary light reflex An LED headlamp. A penlight is a small, pen-sized flashlight, often containing two AA or AAA batteries. In some types, the incandescent light bulb has an integral lens that focuses the light, so no reflector is built into the penlight. Others use incandescent bulbs mounted in reflectors.
The first light pen, at this time still called "light gun", was created around 1951–1955 as part of the Whirlwind I project at MIT, where it was used to select ...
Red (635 nm), blueish violet (445 nm), and green (520 nm) laser pointers. A laser pointer or laser pen is a (typically battery-powered) handheld device that uses a laser diode to emit a narrow low-power visible laser beam (i.e. coherent light) to highlight something of interest with a small bright colored spot.
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In this test, an examiner shines a pen light at the patient's pupil and asks the patient to either point to the light source, or describe the direction that the light is coming from (up, out, straight ahead, down and out, etc.). If the patient is able to perceive light, the letters LP are recorded to represent the patient's acuity.
A medical halogen penlight used to observe pupillary light reflex. Pupillary light reflex provides a useful diagnostic tool for testing the integrity of the sensory and motor functions of the eye. [1] Emergency physicians routinely test pupillary light reflex to assess brain stem function.
Medical halogen penlight: to see into the eye, natural orifices, etc. and to test for pupillary light reflex, etc. Medical ultrasound: to create an image of internal body structures Nasogastric tube: for nasogastric suction or the introduction of food or drugs into the body Nebulizer: to produce aerosols of drugs to be administered by ...