Eyelid laxity is when either an upper or lower eyelid, has had a significant decrease in elastin content. In upper eyelid laxity, the patient can experience an obstruction of the peripheral vision, impacting activities including reading and driving. Lower eyelid laxity impacts that patient negatively when the eyelid begins to pull away from the eyeball. This leaves more exposed area on the eyeball, resulting in excessive tearing and irritation.
Over time, the effects of age and gravity cause the muscles and fat around the eyelids to lose their volume and elasticity. As a result, the eyelids can become loose and move away from their normal position around the eye. The tissue overlying the cheekbones also becomes flatter and sags with time, resulting in a hollow appearance of the lower eyelids, also known as eyelid laxity.
Cited from the Mayo Clinic & the American Academy of Dermatology