Hughe’s paper1 highlights the use of stereolithographic models to facilitate custom-made titanium prosthesis for simple orbital floor reconstructions. In more complex orbital, defects mirror imaging the normal orbit can be helpful in determining the correct shape and volume of the damaged orbit.2 The benefits of these techniques must be weighed against the risks of increased radiation exposure. Computed tomography (CT) now accounts for 50% of total radiation from the medical use of ionising radiation.3 There are various measures of radiation. The ‘tissue absorbed dose’ unit is measured in Grays and is used when discussing the adverse effect of radiation on tissues function, such as cataracts. The ‘equivalent dose’ is the absorbed dose multiplied by a radiation weighting factor and is measured in Sierverts. The radiation weighting factor for X-rays is one, so the equivalent dose equals the absorbed dose. Finally, the ‘effective dose’ takes into consideration which organs have been irradiated and their relative sensitivities to radiation. It is calculated by multiplying the equivalent dose by an organ-specific tissue weighting factor and then summing these values for all organs irradiated. The effective dose is also measured in Sieverts. With improvements in CT, the dose of radiation needed to make accurate stereolithographic models has fallen.1,2,4 However, the dose to the lens of the eye may be high in scanning orbits and the potential for inducing cataracts must be borne in mind.3 The radiation-related risk of a patient developing cancer during their lifetime is inversely proportional to their age; the younger the patient, the greater the risk. Whilst it is important to minimize radiation exposure to all patients, it is particularly important for children. Radiation doses can be reduced by minimising the number of radiographs taken prior to any CT scan, optimising the settings for scan acquisition and scanning the smallest area required to make the stereolithographic model. If a CT scan is needed to assess orbital trauma consideration should be given as to whether a stereolithographic model is indicated so that only one CT scan is taken. Shielding of radiosensitive organs is also beneficial.5 The concept of making an accurate customised plate for orbital reconstruction from a stereolithographic model is attractive. However, it can involve increased exposure to radiation. Whether it gives improved surgical outcomes remains to be established.