Why can’t I see 3D in the cinema?

Readers answer other readers' questions on subjects ranging from trivial flights of fancy to profound scientific concepts
  
  

Woman wearing 3D glasses
The specs don't work ... why? Photograph: Ben Stansall/AFP/Getty Images Photograph: Ben Stansall/AFP/Getty Images

Why can't I experience the 3D effect in 3D format films? All I see is a sharp HD image, but no sense of anything leaping off the screen. Is it because I am long-sighted with astigmatism? Or is there something going on in my head?

Caroline Deans, London SE13

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