| | Study | Cataract definition |
| | Filgueira et al. (2016) | Early age-related cataracts: nuclear (NO = 1 and 2), posterior subcapsular (P = 1 and 2) | | Congdon et al. (2012) | Nuclear (NO ≥ 3) | | Bal et al. (2011) | Nuclear (NO > 2, NC > 2, C ≤ 2, P ≤ 1), cortical (NO ≤ 2, NC ≤ 2, C > 2, P ≤ 1), posterior subcapsular (C ≤ 2, P > 1) | | Nischler et al. (2010) | Nuclear (2 ≤ NO ≤ 4, 2 ≤ NC ≤ 4, C < 2, P ≤ 1.5), cortical (NO < 2, NC < 2, 2 ≤ C ≤ 4, P ≤ 1.5), posterior subcapsular (NO < 2, NC < 2, C < 2, 1.5 ≤ P ≤ 4) | | de Waard et al. (1992) | Advanced age-related cataracts (morphologically not categorized) |
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