How indirect ophthalmoscopes work
An indirect ophthalmoscope is shaped like a headband with a flashlight attached to it. It slips on to the patient’s head, and the examiner looks through the visual optics screen or lens. These devices are much better for scanning for abnormalities than direct ophthalmoscopes, as indirect ophthalmoscopes give a much broader range and much deeper reach than their direct counterparts. Some indirect ophthalmoscopes are monocular, while others are binocular. These devices give the examiner a great view of the retina, with a field of vision that can reach all the way up to Ora serrata. Typically, the ophthalmologist will be able to see through the retina even if they are clouded by cataracts; this is a testament to the power of the light included in this flashlight-like device. The device typically looks through the pupil by dilating it, making it easy for the ophthalmologist to access the structures behind it.
About indirect ophthalmoscopes
Indirect ophthalmoscopes are necessary for thoroughly examining the health of the patient’s optic disc, retina, vitreous humor, and other structures within the eye. The examiner can use eye drops to dilate the eye, or they can achieve an ophthalmoscopy exam without the use of dilation. Indirect ophthalmoscopes produce a negative or reverse image, contrary to that of a direct ophthalmoscope.
Indirect Ophthalmoscope Manufacturers
- Welch Allyn, Inc.
- US Ophthalmic
- And many more