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B-scan ultrasound is considered medically necessary in place of A-scan ultrasound where direct visualization of the retina is difficult or impossible including lid problems (e.g., severe edema, partial or total tarsorrhaphy), keratoprosthesis, corneal opacities (e.g., scars, severe edema), hyphema, hypopyon, miosis, dense cataract, pupillary membranes, or vitreous opacities (e.g., hemorrhage, inflammatory debris).
Note: B-scan ultrasound is considered medically necessary for pre-operative work-up of individuals with Morgagnian cataract.
Note: In general, driving an automobile is the limiting life-style activity with visual acuity in the 20/50 to 20/60 range.
In addition to a comprehensive or brief/intermediate eye examination, A-mode ultrasound (A-scan) may be considered medically necessary prior to cataract surgery to determine the appropriate pseudophakic power of the IOL.
Dick (2005) stated that the potential clinical benefits of accommodative IOL technology for both cataract patients and refractive patients may place accommodative IOLs in a competitive position with multi-focal IOL technology.
Cataracts may result in progressive loss of vision.