It's important to consider medical, ergonomic, postural, environmental & comfort needs on an individual basis. An office chair should be purchased with reference to the height & shape of desk and layout of desktop/laptop equipment it is to be used with. It should be ergonomically set up at your place of work and you must understand how to adjust it to optimise your back care needs. To optimise the benefit of specialist ergonomic seating, you should always try a range of back care chairs prior to purchase, under expert guidance.