Kafin a auna maɓuɓɓugan ganye, a ɗauki hotuna a ajiye fayiloli, a yi rikodin launin samfurin da ƙayyadaddun kayan (faɗi da kauri), sannan a auna bayanan girma.
1. Auna ganyen guda ɗaya
1) Auna maƙallan maƙallan da maƙallan maƙallan
Kamar yadda aka nuna a ƙasa. A auna da ma'aunin vernier. Yi rikodin lambar serial na takardar ganyen bazara inda maƙallin yake, girman matsayin maƙallin (L), adadin maƙallin, kauri abu (h) da faɗi (b) na kowane maƙallin, nisan ramin maƙallin maƙallin (H), girman maƙallin maƙallin, da sauransu.
2) Auna yankewa da kuma yanke kusurwa
Kamar yadda aka nuna a ƙasa. A auna girman b da l da ma'aunin vernier. Yi rikodin bayanai masu dacewa na girma (b) da (l).
3) Auna lanƙwasawa ta ƙarshe da lanƙwasawa
Kamar yadda aka nuna a ƙasa. A auna da ma'aunin vernier da kuma ma'aunin tef. Yi rikodin bayanai na girma (H, L1 ko L, l da h.)
4) Auna gefen niƙa da kuma sashi mai faɗi-madaidaiciya
Kamar yadda aka nuna a ƙasa. Yi amfani da na'urar auna vernier da kuma na'urar auna tef don duba da kuma yin rikodin bayanai masu dacewa.
2. Auna idanu masu birgima
Kamar yadda aka nuna a ƙasa. A auna da ma'aunin vernier da ma'aunin tef. A rubuta ma'aunin da ya dace (?). Lokacin auna diamita na ciki na ido, a kula da yuwuwar samun ramukan ƙaho da ramukan elliptical a cikin ido. Za a auna shi sau 3-5, kuma matsakaicin ƙimar mafi ƙarancin diamita zai rinjaye.
3. A auna idanun da aka naɗe na ganyen
Kamar yadda aka nuna a ƙasa. Yi amfani da igiya, ma'aunin tef da kuma na'urar auna vernier don duba (?) da kuma yin rikodin bayanai masu dacewa.
