The pressure decreases because there is less density meaning there are less atoms or molecules in a space. Gravity determines the density by pulling in more molecules towards â¦ the center of the Earth.
Therefore, about 85-90 percent of children with hereditary retinoblastoma develop multiple tumors that affect both eyes (bilateral disease). The remaining 10-15 percent of patients with hereditary retinoblastoma develop only a single eye tumor (unilateral disease).
Diseases or illnesses that may lead to eyelid drooping include: 1  Brain tumor or other cancer, which can affect nerve or muscle reactions. 2  Diabetes. 3  Horner syndrome. 4  Myasthenia gravis. 5  Stroke.