I didn't realise that about the block design and symbol search tests so thanks for pointing it out. I'm pretty sure the eye test DS had was just a basic eye test. I didn't know there were other sorts of vision tests that you could have actually. I've looked into it now and see that vision problems can be much more complicated than just short/long sightedness. I'll make an appointment for DS to have a comprehensive assessment ASAP. Thanks for the suggestion.