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Commando is a vocation. Eg of vocations: cook, clerk, driver (the top 3 pick before cook got outsourced).
It is not a must to have perfect eyesight (otherwise, 90% of the boys would not be eligible). Must be medically fit (not necessarily physically fit) and mentally sound.
Officer refers to commissioned officer. It’s a collective term referring to the people holding the rank of 2LT, LTA, CPT, MAJ, LTC, COL, BG, MG, LG.
The rest (ie not officer) are generally referred to as ORS (other ranks) - enlisted, specialists and warrant officers. However, this term has long been forgotten (along with the term NCO - non-commissioned officer, which used to encompass the specialists and warrant officers).
some details here
https://www.mindef.gov.sg/oms/arc/our-f ... andos.html