Age | Recorded in months at the time of treatment. |
Anterior chamber cells | Scored from 1 (no cells), 2 (cells +/−), 3 (+) and so on to 6 (++++ of cells). |
Anterior chamber flare | Scored from 1 to 5. 1 was no flare, 2 was + and so on to 5 for ++++. |
Anterior chamber invasion | Presence of anterior chamber (AC) invasion scored 1 and no invasion scored 2. |
Iritis | Summary variable constructed by the addition of the two variables anterior chamber cells and anterior chamber flare. |
Largest tumour diameter (LTD) | Largest tumour diameter as measured on ultrasonography in millimetres at presentation. |
Lipofuscin | No lipofuscin, or the presence of drusen, scored 1. Presence of lipofuscin scored 2 and the presence of a collar stud lesion scored 3. |
Location 1 | Average of the shortest distance from edge of tumour to fovea and to the optic disc in millimetres. Overlap scored 0. |
Location 2 | Refers to which area the tumour appeared centred on. It was scored in as posterior pole (1), equator (2), ora serrata (3) and ciliary body (4). |
Pigment | Melanotic tumours scored 1 and amelanotic tumours scored 2 |
Pressure | Recorded, in mm Hg, for presentation (IOP) and for 8 weeks (IOP − 8). |
Retinal detachment | Absence of subretinal fluid was scored as 0. The presence of subretinal fluid as determined by slit lamp biomicroscopy with a hand held 78 or 90 DS lens or by fluorescein angiography but not visible by indirect ophthalmoscopy with a 20 DS lens scored 1. Retinal detachment observed by indirect ophthalmoscopy involving less than 1 quadrant scored 2, involving one quadrant or more but less than two quadrants scored 3, more than two but less than 3 quadrants scored 4, more than 3 but less than total scored 4 and total retinal detachment scored 5. |
Sex | Dichotomous variable. Male scored as 1 and female as 2. |
Side | Dichotomous variable. Right scored as 1 and left as 2. |
Visual acuity | The best visual acuity recorded, with pinhole and refraction, for the tumour containing eye at presentation. 6/6 was coded as 1, 6/9 as 2, 6/12 as 3, 6/18 as 4, 6/24 as 5, 6/36 as 6, 6/60 as 7, 1/60 as 8, counting fingers as 9, hand movements as 10, perception of light as 11, and blind as 12. |
Vitreous haemorrhage | Presence of vitreous haemorrhage scored 1 and absence scored 2. |