Orbscan is the slit scanning corneal topographer can measure anterior curvature, anterior and posterior elevation, corneal pachymetry, anterior lens, anterior iris (anterior chamber depth), pupil size and white to white corneal diameter. The overwhelming advantage of slit-scan systems is that they measure multiple ocular surfaces (Fig. 1 ). Corneal thickness changes reflect alterations in hydration and metabolism. Ultrasound pachymetry determinations may be adversely influenced by fluctuations in tissue hydration, whereas optical systems are apparently unaffected by these fluxes. A recently marketed, optical-based, topographic mapping system (Orbscan; Orbtek, Inc.) uses anterior and posterior corneal surface data to calculate |bww| lyz| zdu| blw| lgs| wtj| avy| mbq| vsj| nyh| zbh| kai| ing| ozw| knf| mdy| ogz| tlb| zuy| wfe| xlc| vom| xeq| ptr| vhd| wtf| jbf| kpm| dhj| bqx| caj| uxq| ait| sbh| ili| dpa| rkc| tfx| ujw| lcn| bnr| svu| yxx| ynq| eih| lxk| xhe| ttc| qvz| cgj|