Frontalis overaction may mask ptosis to some degree and it is important to be aware of this when assessing patients. When considering a brow suspension procedure it is necessary to check that good frontalis action is present. A point on the brow is defined and its excursion measured with the brow relaxed and then raised, which should be about 10mm (Figure 5.3). If the patient finds it difficult to relax a habitually raised brow then he/she should be instructed to frown and then relax.
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