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With the use of a handheld lens, the part of the retina of which OCT sans can be made is identical to the field of view of the handheld lens.
The effect is not due simply to blur, since a blurring of the display with a handheld lens leads to the perception of vertical internal motion in foveal vision.
Next to the handheld lens, a specifically designed fixed lens (the fundus viewer) can be used to make scans of the posterior pole.
Although scans can be made through a handheld lens, in this study scans were made through the fundus viewer lens designed by Topcon, a 60D Volk lens fixed in a lens holder.
With a handheld lens or a 3-mirror-contact lens even the far peripheral retina can be scanned, which has an added diagnostic value, for example, in the differentiation between senile retinoschisis and retinal detachment [ 2].
The OCT scans of the posterior segment can be made through a handheld lens, while the alignment for the sample arm is corrected by a fast Z-axis tracking system.
Similar(54)
The rule used to be that a handheld long lens could not be used in low-light shutter speeds of less than 1/250.
For instance, a 50mm lens should be casually handheld at speeds no slower than 1/50 second; a 200mm lens should be no slower than 1/200.
Paired with the D90 is the new AF-S DX Zoom-NIKKOR 18-105mm f/3.5-5.6G ED VR lens, which provides a versatile 5.8x optical zoom and VR image stabilization, for even sharper handheld picture taking.
Palm dubs its models "handheld".
Will Dell Hand It To Handheld Makers?
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