Average cost to patients per annum (by group) of purchasing habitual form of optical correction
| Spectacles | Contact lenses | |
| Group 1 | £230 | Lenses £60, solutions £120 |
| Group 2 | £130 | Lenses £80, solutions £95 |
| Group 3 | £90 | Lenses £90, solutions £100 |
| Group 4 | £100 | Lenses £140, solutions £120 |