BACKGROUND:Obstructive sleep apnea (OSA) is a well-established risk factor for hypertension and cardiovascular morbidity and mortality. More recently. OSA has been implicated as an independent risk factor for chronic kidney disease. Urinary neutrophil gelatinase-associated lipocalin (NGAL) is a well-accepted early biomarker of subclinical kidney tubular injury. https://www.roneverhart.com/Calvin-Klein-CK21501-Eyeglasses-SOFT-TORTOISE-Clear-demo-lens/