Me kahi ʻāpana ma ka ʻāpana haʻahaʻa o ka lens, hōʻike kahi lens bifocal i ʻelua mau mana dioptric like ʻole, e hāʻawi ana i nā mea maʻi i ka ʻike kokoke a mamao.
ʻOiai ke kumu e pono ai ʻoe i kahi ʻōlelo kuhikuhi no ka hoʻoponopono ʻana i ka ʻike kokoke, hana like nā bifocals āpau. Aia ma kahi ʻāpana liʻiliʻi ma ka ʻaoʻao haʻahaʻa o ka lens ka mana e pono ai e hoʻoponopono i kāu ʻike kokoke. ʻO ke koena o ka lens no kāu ʻike mamao. ʻO ka māhele lens i hoʻolaʻa ʻia i ka hoʻoponopono ʻike kokoke i hiki ke lilo i kekahi o nā ʻano like ʻole.