Features of meningitis have been reported as well as septic encephalopathy, stroke, and Guillain-Barre Syndrome. Some patients present with very low blood pressure and shock, and they may require urgent admission to a paediatric intensive care unit.Cardiovascular involvement is very frequent. Acute heart failure is common in the form of left ventricular dysfunction, and a left ventricular ejection fraction under 60% is frequent. Shock is often of myocardial – mainly left ventricular – origin. Respiratory symptoms are less common, and are not usually a prominent feature. When present, breathing difficulties are often linked to shock, and are suggestive of heart failure. Some children display features of a cytokine storm, including extremely high serum interleukin-6 (IL-6) levels, and need inotropic support to maintain cardiac output. Coronary artery abnormalities, such as dilatation, are frequent. Some children have developed coronary artery aneurysms. Electrocardiographic (ECG) abnormalities are common. Other cardiological features sometimes include inflammation of the heart valves (valvulitis) and of the fibrous sac surrounding the heart (pericarditis). Echocardiographic features of myocarditis (inflammation of the heart muscle) have been recorded.Affected children consistently show laboratory evidence of hyperinflammation. Pronounced biological markers of inflammation generally include strongly raised erythrocyte sedimentation rate (ESR), C-reactive protein (CRP), procalcitonin, ferritin, and IL6. Low platelet counts and impaired blood clotting (coagulopathy) are also common, with  increased levels of D-dimer and fibrinogen. Other haematological features include raised numbers of white blood cells (leukocytosis), characterized by high numbers of neutrophils, with many immature forms, and low numbers of lymphocytes (lymphopaenia).
Eye drops intended to restore lens elasticity are also being investigated. Etymology
The term is from Greek πρέσβυς presbys meaning "old" and ὤψ ōps meaning "sight" (GEN ὠπός ōpos). History
The condition was mentioned as early as the writings of Aristotle in the 4th century BC. Glass lenses first came into use for the problem in the late 13th century. See also
Vuity

References
External links

"Presbyopia" at MedLinePlus Medical Encyclopedia