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Definition of image quality classification.
| Image quality | Visibility | Clarity |
|---|---|---|
| Good | Artefacts or eye abnormalities cover less than 1/4 of image | Level III vascular arches are visible |
| Poor | ||
| Eye abnormality associated | Eye abnormalities cover more than 1/4 of image | Level III vascular arches or larger vascular arches are invisible |
| Artefact associated | Artefacts cover more than 1/4 of image | Level III vascular arches or larger vascular arches are invisible |
