Dr. Grossman’s Blog

Researchers at the University of Western Australia recently examined the effects of wearing swimming goggles upon intraocular pressure (IOP).

In this study, holes were drilled into the faces of 13 different goggles to allow IOP measurement by applanation tonometry. IOP was measured before goggles wear, two minutes after goggles application, twenty minutes after goggles application, and after goggles removal. Multiple types of goggles were tested.

IOP increased while wearing goggles by a mean pressure of 4.5 mm Hg with this pressure rise being sustained for the duration of goggles wear. Swim goggles with a smaller face area were consistently associated with greater IOP elevation.

Although these measurements were not taken while swimming, study authors suggest that some swimming goggles can elevate IOP. The full article can be read in the British Journal of Ophthalmology.

Learn more about natural eye care at www.naturaleyecare.com

NaturalEyeCare™ provides a practical approach to keeping your eyes healthy, emphasizing prevention rather than cure, based on the latest scientific research.

SOURCE: “Wearing swimming goggles can elevate intraocular pressure”, Morgan, et al, Br J Ophthalmol. 2008 Sep;92(9):1218-21.

Researchers tie blood pressure and ocular perfusion pressure to glaucoma

Although intraocular pressure (IOP) is considered a primary risk factor for the development of glaucoma, there is evidence to suggest that glaucoma may continue to progress despite lowering patients’ IOP to targeted levels.

Several recent studies point to vascular risk factors in the development of glaucoma. This new research indicates that blood pressure (BP) and ocular perfusion pressure have become increasingly important in understanding and treating glaucoma.

Although doctors cannot currently visualize ocular blood flow directly, they can easily measure glaucoma patients’ BP and IOP to calculate their ocular perfusion pressure and quantify the vascular changes.

An article published in the British Journal of Ophthalmology explores the relationships between BP and IOP, BP and glaucoma, and perfusion pressure and glaucoma. Study authors suggest that ocular perfusion pressure and its fluctuation may be parameters that need to be measured in the treatment of glaucoma patients.

Learn more about glaucoma, including self-help tips

SOURCE: Blood Pressure and Glaucoma, Costa, et al, Br J Ophthalmol, 30 March 2009, doi:10.1136/bjo.2008.149047.

Researchers in Italy have released a study indicating that nutritional supplements of bilberry and French maritime pine bark can help reduce intra-ocular pressure (IOP). While several factors contribute to the development of glaucoma, elevated IOP is one of the greatest risks. An improved ocular blood flow may help prevent glaucoma.

Authors of the study from the University of Chieti-Pescara in Italy studied thirty-eight subjects with intraocular hypertension. Twenty subjects were given bilberry and French maritime pine bark; eighteen subjects were not treated. The visual acuity, IOP, and ocular blood flow were measured at two, three, and six months. After two months, the group taking the supplements showed a decrease in the mean IOP. No side effects were observed and ocular blood flow improved.

Having reviewed the results, these researchers believe that food supplements of bilberry and pine bark may represent a safe preventative intervention for lowering the risk of developing glaucoma by supporting a healthier pressure in the eyes.

Read more research on glaucoma

Learn about bilberry and other natural supplements for healthy vision

SOURCE: “Effects of Mirtogenol on ocular blood flow and intraocular hypertension in asymptomatic subjects”, Robert Steigerwalt Jr., et al, Molecular Vision 2008; 14:1288-1292.