Mgbe ọtụtụ afọ gasịrị, ụlọ ọrụ anyị nwere ike ịnya isi akara ngwaahịa zuru oke n'ọhịa nke lenses ahaziri. lenses na-aga n'ihu, anya anya m na-agba agba, lenses mgbochi-acha anụnụ anụnụ, nnukwu anya m na-ehulata iberi, anyị nwere ha niile The okomoko nke nnukwu nchekwa ikike na-enye ohere Zhenjiang Ideal uru nke minimized iji nzaghachi oge ma si otú nye ya ahịa na ngwa ngwa nnyefe ngwaahịa.
Site na mmalite, àgwà nke ọrụ anyị enwetawo ntụkwasị obi na mmasị nke ndị na-azụ anyị, ma nye anyị ohere ịmepụta ọwa ire ere na mpaghara iri atọ nke obodo anyị nakwa na anyị na-ebupụ nke ọma na Europe, America, Middle East Africa na Southeast Asia. na-agbasa karịa mba iri isii. N'ọdịnihu, anyị bu n'obi imeziwanye ogo ngwaahịa na ọrụ anyị dị elu, otu ụbọchị wee bụrụ ụlọ ọrụ na-emepụta ihe na mba na ụlọ ọrụ optometry.
