| PCO grade | Definition | |
| Grade 0 | Clear posterior capsule | |
| Grade 1 | PCO not seen in the central visual axis. | |
| A clear view of the optic nerve head and retinal nerve fibre layer and blood vessels is obtained | ||
| Grade 2 | PCO seen in the central visual axis with mild obscuration of fundus detail: optic nerve head is clearly seen but retinal nerve fibre layer and blood vessels are blurred | |
| Grade 3 | PCO in the central visual axis with marked blurrring of fundus details: the margins of the opric nerve head is not clearly defined | |
↵Patients are examined with a undilated pupil using a direct ophthalmoscope.