title: A counter for fixed-frame endothelial cell analysis.
abstract: We developed a simple electronic counter for fixed-frame endothelial cell analysis by modifying an ink cartridge pen and an inexpensive pocket calculator.
mesh_terms: D002452:Cell Count / Q000295:instrumentation*; D003315:Cornea / Q000166:cytology*; D004727:Endothelium / Q000166:cytology; D006801:Humans; D009885:Ophthalmology / Q000295:instrumentation*