FES is an often forgotten and underdiagnosed entity characterized by flaccid and easily everted upper lids, occurring spontaneously or with minimal manipulation. It is usually seen in overweight, middleaged males who complain of a foreign body sensation, burning, tearing and redness. Some studies have found an interesting association with OSAS [1,2]. This relationship may have both diagnostic and therapeutic implications. Nevertheless, the majority of OSAS patients, obese or non-obese, do not have FES. Furthermore, FES may also be a presenting symptom in patients with undiagnosed OSAS [2]. Although the cause remains unknown, in all probability OSAS has no real causative relationship, other than a sequence of extreme apnea, right heart failure, and increased venous pressure that worsens a propensity for this phenomenon. Additionally, treatment of obesity and OSAS may have a favourable effect on the course of FES [3]. The clinician should be aware of this association so that both underlying OSAS or FES can be detected. The condition should be suspected in any obese patient with chronic watery and red eyes. Besides weight loss and continuous positive airway pressure therapy if OSAS is suspected, treatment consists of supportive measures such as ocular lubrication, eyelid taping, or an eyeshield at bedtime to keep the eyelids closed while sleeping, and surgery to address horizontal laxity and redundant eyelid tissues.