Intraocular Pressure: Does it Measure Up?
نویسندگان
چکیده
The relationship between intraocular pressure (IOP) and glaucoma is complex and not fully understood. We question the validity of several claims relating to the IOP-glaucoma relationship: (1) that 12 mm Hg is an important target in IOP control; (2) that IOP variability is an important risk factor for glaucoma progression; and (3) that every millimeter of mercury of IOP lowering reduces the risk of glaucoma progression by some specific percentage amount. Further, IOP is generally accepted to be an important - if not most important - risk factor for glaucoma development and progression. Using measures of treatment effect - absolute risk reduction, relative risk, and relative risk reduction - we compare the strength of IOP as a risk factor to the strength of a cardiac risk factor in cardiovascular disease.
منابع مشابه
Cerebral dehydration action of glycerol. I. Historical aspects with emphasis on the toxicity and intravenous administration.
nervous system. Prolonged continuous administration of glycerol does not produce marked alteration of fluid and electrolytes. It is almost totally excluded from the brain, which excludes the problem of rebound overhydration. It has significant nutritional value nad none of the side effects of steroids. The maior toxic effects of glycerol (hemolysis, hemoglobinuria, and renal failure) can be pre...
متن کاملEvaluation of the diurnal intraocular pressure fluctuations and blood pressure under dehydration due to fasting
Introduction: This study aimed to investigate the diurnal intraocular pressure fluctuations under dehydration conditions and the relationship between the intraocular pressure fluctuations and blood pressure. Methods: The intraocular pressures (IOP), body weights, as well as systolic and diastolic blood pressures (SBP, DBP) of 36 fasting healthy volunteers were recorded at 8:00 a.m. and 5:00 p.m...
متن کاملUnderstanding and caring for a Schiotz tonometer
A Schiotz tonometer is an instrument for measuring the intraocular pressure (IOP). Although the Schiotz tonometer does not make as precise measurements as other types of tonometers, it is inexpensive, simple to use, durable, requires little maintenance, does not have electronics, does not require batteries, and can be stored for years between uses. These qualities make it well suited for screen...
متن کاملHow to measure intraocular pressure: applanation tonometry
Unless there is a contraindication (e.g. trauma or corneal ulcer), all adults attending an eye unit should have their intraocular pressure (IOP) measured. Many people with glaucoma have no symptoms and do not know they have the condition. All children who have had cataract surgery should also have their IOP measured at every follow-up visit, if possible. Finding glaucoma early allows treatment ...
متن کاملThe Tonometric Sensor, a New Device for the Measurement of Intraocular Pressure
In this paper we present a new sensor for the measurement of intraocular pressure. We have applied the indentation principle, in which the eye is indented by exerting a force on it, while the size of the indented area is monitored. To measure the force we have used a commercial force sensor. The sensor to measure the indentation of the eye has been developed in our laboratories. We have perform...
متن کامل