A i-lensmeter okanye i-lensometer, eyaziwa ngokuba yi-focimeter okanye i-vertometer, sisixhobo se-ophthalmic.Isetyenziswa kakhulu ngoogqirha bamehlo kunye noogqirha bamehlo ukuqinisekisa ummiselo ochanekileyo kwiperi yeglasi yamehlo, ukuqhelanisa ngokufanelekileyo nokuphawula iilensi ezingasikwanga, kunye nokuqinisekisa ukunyuswa okuchanekileyo kweelensi kwiifreyimu zokubukela.