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 features of instruments used that determine which of the two procedures is adopted. For this reason, each type of examination uses its appropriate funduscope. The direct funduscope is tiny, almost the size of a hand-held torch, with potent lenses offering enlargement.
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.
The other advantage is that it provides better clarity for the opacities of the retina. This is due to the enhanced lighting that promotes visualization through the thick cloudy media. This type of ophthalmoscope has the ability to improve vision by separating paths of incident and reflected lights.
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.
When using a binocular instrument, the examiner gets access to stereoscopic view. This allows visualization of retinal detachment possible in three dimensions. The procedure also produces high quality stereoscopic images that are well illuminated. The complete equipment is portable. When used, the lens is held at arm's length close to the patient's eye. This sets the examiner away from the patient, which is not intimidating in the case of apprehensive patients.
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.
Some disadvantages of going for the indirect funduscope include the complications of inverted vertical and horizontal images, along with lowered levels of magnification. It must be remembered that acquiring a perfect perspective can take a lot of time and patience. No technique is ever perfect, but some offer advantages over other comparative ones. Currently, the binocular indirect ophthalmoscope is preferred in the optometry market because of its many advantages.
There are different features of instruments used that determine which of the two procedures is adopted. For this reason, each type of examination uses its appropriate funduscope. The direct funduscope is tiny, almost the size of a hand-held torch, with potent lenses offering enlargement.
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.
The other advantage is that it provides better clarity for the opacities of the retina. This is due to the enhanced lighting that promotes visualization through the thick cloudy media. This type of ophthalmoscope has the ability to improve vision by separating paths of incident and reflected lights.
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.
When using a binocular instrument, the examiner gets access to stereoscopic view. This allows visualization of retinal detachment possible in three dimensions. The procedure also produces high quality stereoscopic images that are well illuminated. The complete equipment is portable. When used, the lens is held at arm's length close to the patient's eye. This sets the examiner away from the patient, which is not intimidating in the case of apprehensive patients.
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.
Some disadvantages of going for the indirect funduscope include the complications of inverted vertical and horizontal images, along with lowered levels of magnification. It must be remembered that acquiring a perfect perspective can take a lot of time and patience. No technique is ever perfect, but some offer advantages over other comparative ones. Currently, the binocular indirect ophthalmoscope is preferred in the optometry market because of its many advantages.
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