How often have I heard this comment from clients – the answer is it is all about expectation. Do you expect to have 3 foot square coloured pictures of an object you want to visualise. This is true for some people but not many. You may have a black and white picture, a cartoon, or just know what something looks like without a firm image.
If you were not able to visualise you would never be able to find your car, not recognise your friends and family, have no idea where you live, never be able to go to the shop for a loaf of bread or 6 eggs, because you would have no idea what to look for. Everyone who is functioning on the planet can visualise, it is just a question of realising how it works for you and how to use it. We all have a visual memory and with practice it will improve.
Just start recalling familiar objects, say your garden, take a look around and notice the fences, the trees etc. Then select a specific object like the bird table and as you focus on it you will find it becomes clearer, a bit like a photograph developing. You will find if you just play with images you will become better and better.
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