Laser Scheimpflug videography.
Conventional Scheimpflug photography uses slits with a constant width of 80 microns. This parameter limits the resolution as sharp contours are imaged with a basic uncertainty. In order to reduce this basic uncertainty we developed an illumination slit with a width of 20 microns and less, using a green helium-neon laser (543 nm). With this slit, much sharper imaging of ocular contours can be achieved. Since this illumination is coupled to on-line videographic detection of the Scheimpflug image, any adjustment of the target is done under visual control at the monitor. Using this device, the slope of a densitogram of contrasted contours (for example the corneal surfaces) is steeper, which guarantees a more accurate detection of corneal thickness and curvature.
Huebscher
H J
HJ
Augenklinik im Klinikum Buch, Berlin, Germany.
Möller
D E
DE
Seiler
T
T
D003315:Cornea / Q000033:anatomy & histology*; D003720:Densitometry; D006801:Humans; D007834:Lasers; D010781:Photography / Q000295:instrumentation*; D014741:Video Recording