Study categorisation of visual fields by BD8 terminology
| Category | Definition | BD8 terminology | |
|---|---|---|---|
| 1 | Field contracted to ⩽10° | Very contracted, especially if the contraction is in the lower part of the field | |
| 2 | Field contracted to: | ||
| ⩽10° in the lower part of the field, | |||
| >10° but ⩽15° in the upper part of the field | |||
| 3 | Field contracted to >10° but ⩽15° | Very/marked contracted | |
| 4 | Field contracted to >15° but ⩽20° | Moderate contraction | |
| 5 | Gross field defect—for example, hemianopia | Gross field defect | |
| 6 | Field not in the above categories | Full field | |