A lensmeter kana lensometer, inozivikanwawo sefocimeter kana vertometer, chiridzwa chemaziso. Inonyanya kushandiswa nevanoongorora maziso nevanoongorora maziso kuti vaone kuti ndeipi yakanyorwa mumagirazi emaziso, kutarisisa zvakanaka uye kumaka malenzi asina kuchekwa, uye kusimbisa kukwira chaiko kwemalenzi mumafuremu ezviratidziro.