View clinical trials related to Retinal Vascular.
Filter by:It has been known that a pregnant women undergoes significant anatomical and physiological changes that mainly caused by hormonal and hematologic changes during pregnancy. Due to advance in reproductive medicine, the incidence of multifetal pregnancy was increased to 3% of livebirth. Multifetal pregnancies produce much more physiological changes in the body compared to the singleton pregnancies. Physiologic ocular changes during pregnancy are the followings - Melanogenesis of eyelid and facial skin - Cellular alteration of lacrimal and meibomian gland - Increased corneal thickness and corneal curvature - Increased lens thickness - Increased retinal vascular density - Increased choroidal thickness Decreased intraocular pressure -
Changes of luteinizing hormone (LH), estrogen and progesterone during the menstrual cycle influence the ocular physiology in both anterior and posterior segments. From the literature review, there were no significant differentiation in tear physiology, anterior chamber dept, lens thickness and refractive status. Some studies demonstrated then the central corneal thickness was thinner in the follicular phase, but this is non-conclusive. Advance in ophthalmic technologies provide few studies of posterior segment changes during the menstrual cycle, however, there were quite difference in methodology such as detection methods of ovulation.
This study investigates the influence of acute exacerbation of chronic obstructive pulmonary disease (COPD) on retinal microcirculation, on functional status and also investigates the prognostic value of retinal vessel caliber assessment in terms of hospitalization and mortality during 2 years of follow-up.