What is indirect Fundoscopy?
Ismael Cordero. The binocular indirect ophthalmoscope, or indirect ophthalmoscope, is an optical instrument worn on the examiner’s head, and sometimes attached to spectacles, that is used to inspect the fundus or back of the eye. It produces an stereoscopic image with between 2x and 5x magnification.
Why is indirect ophthalmoscopy preferred over direct ophthalmoscopy?
In comparing direct vs indirect ophthalmoscope, the indirect ophthalmoscope delivers a stronger source of light, greater opportunity for stereoscopic inspection of the eyeball interior, and a specifically designed objective lens.
Why indirect ophthalmoscope is called indirect?
BIO is one of the ways used to view the retina, with a wide field of the retina and stereoscopic view. BIO also allows dynamic observation of the retina by moving the BIO device, lens, and applying scleral depression. The process is “indirect” because the fundus is viewed through a hand held condensing lens.
When is a direct ophthalmoscopy used?
The direct ophthalmoscope allows you to look into the back of the eye to look at the health of the retina, optic nerve, vasculature and vitreous humor. This exam produces an upright image of approximately 15 times magnification. The Large aperture is used for a dilated pupil after administering mydriatic drops.
What are the differences between direct and indirect ophthalmoscopy?
Direct ophthalmoscopy one that produces an upright, or unreversed, image of approximately 15 times magnification. Indirect ophthalmoscopy one that produces an inverted, or reversed, image of 2 to 5 times magnification.
What is a 20D lens used for?
| Table 1. Indirect Lenses and Their Typical Use | ||
|---|---|---|
| Power | Purpose | Application |
| 20D | View the retina including periphery using a head-mounted BIO | Higher magnification than 28D. Ideal for pediatric examination, when scleral indentation is required and for patients with nystagmus. Useful when slit lamp examination is not possible. |
What are the advantages of direct ophthalmoscope?
Advantages of direct ophthalmoscopy have traditionally included (1) a 15× magnified view of the posterior pole that facilitates appreciation of small, dynamic changes of the ocular fundus, such as venous pulsations and circulatory changes; (2) wide availability and portability—the direct ophthalmoscope is easily …
What’s the difference between direct and indirect ophthalmoscope?
The direct ophthalmoscope is an instrument about the size of a small flashlight (torch) with several lenses that can magnify up to about 15 times. An indirect ophthalmoscope, on the other hand, constitutes a light attached to a headband, in addition to a small handheld lens.
What is direct ophthalmoscope used for?
The direct ophthalmoscope is the instrument of choice for fundus examination by medical students and physicians. It allows for a magnified, monocular image of the retina and optic disc.
What is the difference between direct and indirect ophthalmoscopy?
Can you see the fundus with direct?
As the direct ophthalmoscope is still the main instrument of choice for fundus examination in optometric practice these skills are essential prerequisites for the development of good diagnostic ability.
What is a direct ophthalmoscope used for?
This reflection is achieved using a mirror or prism. The illuminated retina is seen directly by the health professional (the user) through the iris of the patient. The ophthalmoscope can be adjusted to suit the task at hand.
When to use the direct ophthalmoscope or the fundus?
The direct ophthalmoscope is a critical tool used to inspect the back portion of the interior eyeball, which is called the fundus. Examination is usually best carried out in a darkened room.
What does funduscopic examination of the eye mean?
Funduscopic examination is a routine part of every doctor’s examination of the eye, not just the ophthalmologist’s. It consists exclusively of inspection. One looks through the ophthalmoscope (Figure 117.1), which is simply a light with various optical modifications, including lenses.
How are indirect ophthalmoscopes used in the field?
Indirect ophthalmoscopes have proven to be an exceptionally valuable device for the treatment and diagnosis of detachments, holes, and retinal tears. In order for the satisfactory use of an indirect ophthalmoscope, the patient’s pupils must be completely dilated. Indirect ophthalmoscopes can be divided into two different categories that include:
Which is the only doctor to perform a funduscopic examination?
Only ophthalmologists perform retinoscopy and indirect ophthalmoscopy, which require other equipment and provide different information. Funduscopic examination is a routine part of every doctor’s examination of the eye, not just the ophthalmologist’s. It consists exclusively of inspection.