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. Author manuscript; available in PMC: 2022 Jan 1.
Published in final edited form as: Prog Retin Eye Res. 2020 May 8;80:100863. doi: 10.1016/j.preteyeres.2020.100863

Table 2. Krachmer and Modified Krachmer Grading Scales. (Krachmer et al., 1978; Louttit et al., 2012).

Measurements taken at the widest diameter of confluence after rotating the slit beam and measuring the diameter by narrowing the length of the beam.

Grade Guttae Edema
Krachmer Grading Scale
0 0 to 12 central guttae No
1 >12 central, non-confluent guttae No
2 1 to 2 mm of confluent, central guttae No
3 2 to 5 mm of confluent, central guttae No
4 >5 mm of confluent, central guttae No
5 >5 mm of confluent, central guttae Stromal or epithelial edema
Modified Krachmer Grading Scale
0 No guttae No
1 ≤12 central/paracentral nonconfluent guttae No
2 >12 central/paracentral nonconfluent guttae No
3 1 to 2 mm of confluent, central/paracentral guttae No
4 2 to 5 mm of confluent, central/paracentral guttae No
5 >5 mm of confluent, central/paracentral guttae No
6 >5 mm of confluent, central/paracentral guttae Stromal and/or epithelial edema