Ophthalmoscopy is examination of the inner part of the eye with the help of an instrument known as an ophthalmoscope. The procedure falls into two categories, direct as well as indirect ophthalmoscopy. In direct ophthalmoscopy, the eye's image is produced as an upright image that is up to fifteen times the original size. The latter inverts the image not beyond five times the sizes and the instrument used is an indirect ophthalmoscope.
There are different characteristics of the instrument that differentiates between the two types of the procedure. For this reason, each of the procedure has its special type of instrument. The direct instrument is small, about the size of a flashlight with powerful lenses for magnification.
This instrument is commonly used during run-of-the-mill examinations. The indirect funduscope has a headband that projects a light that works in conjunction with a small hand-held lens. The latter supports a broader view of the inner eye structure.
Using the procedure has advantages over its counterpart. It offers a wide field of view that gives a clearer view of fundus of the eye, possible even when the lens covered by cataracts. The field of view increases to thirty degrees using the powerful condensing lenses. This enables peripheral viewing of the retina which is better. The increased field of view also improves retinopathy assessment process.
An additional feature is enhanced clarity of the retinal opacities, improved by clearer lighting that enables visualization through any dense cloudy obscurity. The augmented perception forms when channels of the incident and the reflected lights become separated, which does not happen in the case of the direct method. Oblique illumination is boosted by augmenting the pigmented lens size. In addition, the funduscope can be either monocular or binocular and is used during peripheral viewing of the retina.
The stereoscopic images that result from this equipment are of high quality and illuminated well. The equipment itself is very portable and the doctor or examiner only needs to hold the lens at proximity of length of arm close to the eye of the patient. The advantage this gives is that the patient will not be intimidated at all however apprehensive they may be.
The increased working distance between patient and doctor cal allow for lower powered lenses that help keep a larger field of view. The degree of cooperation is also not required, a case common with direct ophthalmoscopy. Also, the examination of the inner part of the eye using ophthalmoscope process is used to view the retina to the extreme ends. This allows a holistic assessment of the eye by the examiner and may find underlying or hidden problems.
There are disadvantages of using the indirect ophthalmoscope as well, including the issues inverted horizontal and vertical images, lowered levels of magnification. Also, obtaining a perfect view can take plenty of time and requires patience. No technique is perfect, but some are quite advantageous over closely related ones. Currently, the binoculars procedure is the most preferred kind in the market based of the above advantages.
There are different characteristics of the instrument that differentiates between the two types of the procedure. For this reason, each of the procedure has its special type of instrument. The direct instrument is small, about the size of a flashlight with powerful lenses for magnification.
This instrument is commonly used during run-of-the-mill examinations. The indirect funduscope has a headband that projects a light that works in conjunction with a small hand-held lens. The latter supports a broader view of the inner eye structure.
Using the procedure has advantages over its counterpart. It offers a wide field of view that gives a clearer view of fundus of the eye, possible even when the lens covered by cataracts. The field of view increases to thirty degrees using the powerful condensing lenses. This enables peripheral viewing of the retina which is better. The increased field of view also improves retinopathy assessment process.
An additional feature is enhanced clarity of the retinal opacities, improved by clearer lighting that enables visualization through any dense cloudy obscurity. The augmented perception forms when channels of the incident and the reflected lights become separated, which does not happen in the case of the direct method. Oblique illumination is boosted by augmenting the pigmented lens size. In addition, the funduscope can be either monocular or binocular and is used during peripheral viewing of the retina.
The stereoscopic images that result from this equipment are of high quality and illuminated well. The equipment itself is very portable and the doctor or examiner only needs to hold the lens at proximity of length of arm close to the eye of the patient. The advantage this gives is that the patient will not be intimidated at all however apprehensive they may be.
The increased working distance between patient and doctor cal allow for lower powered lenses that help keep a larger field of view. The degree of cooperation is also not required, a case common with direct ophthalmoscopy. Also, the examination of the inner part of the eye using ophthalmoscope process is used to view the retina to the extreme ends. This allows a holistic assessment of the eye by the examiner and may find underlying or hidden problems.
There are disadvantages of using the indirect ophthalmoscope as well, including the issues inverted horizontal and vertical images, lowered levels of magnification. Also, obtaining a perfect view can take plenty of time and requires patience. No technique is perfect, but some are quite advantageous over closely related ones. Currently, the binoculars procedure is the most preferred kind in the market based of the above advantages.
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