it's like 98 for someone who obtains a semi-decent umat score (175/300?).
The cut-off's at 95, like mbbs, at unsw. To be admitted, you would need to compensate with a high umat score.
If you're set on optometry, you may consider doing a some course, then transferring into boptom bsc, or doing bsc (vision science), which isn't optom and doesn't actually resemble it too much to any large extent.