Clinical Trial: Intraocular Pressure Variation by Pneumatic Tonometer Before and After Phacoemulsification

Study Status: Completed
Recruit Status: Completed
Study Type: Observational

Official Title: Intraocular Pressure Variation by Pneumatic Tonometer Before and After Phacoemulsification

Brief Summary: The objective of this study is to evaluate the IOP variation before and 30 days after performing phacoemulsification through pneumatic tonometry, in addition to evaluating the factors possibly related to this variation.

Detailed Summary:

Cataracts represent the major cause of treatable blindness in developing countries. According to data , there are 45 million blind people in the world, of which 40% is due to cataract etiology. In Brazil, there are about 350,000 individuals blinded by cataracts.

One of the consequences observed after the cataract surgery is the variation of intraocular pressure (IOP). IOP is directly related to the volume of aqueous humor in the anterior chamber. Reports of oscillations after a cataract surgery range from +1.3 to -2.5 mmHg. The duration of this oscillation varies according to the literature studied. Some studies show that the oscillation seen in the first postoperative year was maintained for the 10-year period and was similar in patients of all ages. However, other authors have identified a non-permanent oscillation, which makes this topic controversial in ophthalmology.

There are a number of factors related to the degree of IOP reduction after a cataract surgery. Studies have shown that the preoperative IOP value, the depth of the anterior chamber, the volume of irrigation used during surgery and the age of the patients may interfere with the IOP variation in the postoperative period.

However, the gold standard tonometer for IOP measurement is Goldmann's. This measurement is closely related to important characteristics of the cornea, such as its thickness and curvature, and may underestimate or overestimate IOP values.

Another way to measure IOP is through a non-contact tonometer, blow or pneumatic. The blow tonometer has a pneumatic system that produces a jet of air, which leads to flattening of the cornea and on the surface of which a beam of parallel light rays is projected, in which only the reflected parallel and coax
Sponsor: VER Excelência em Oftalmologia

Current Primary Outcome: Intraocular Pressure Variation by Pneumatic Tonometer Before and After Phacoemulsification [ Time Frame: Six months ]

Original Primary Outcome: Same as current

Current Secondary Outcome:

Original Secondary Outcome:

Information By: VER Excelência em Oftalmologia

Dates:
Date Received: January 6, 2017
Date Started: July 2015
Date Completion:
Last Updated: January 6, 2017
Last Verified: January 2017