Cataract Surgery & Lens Implant Measurements

Baltimore Washington Eye Center, Maryland

Thursday, July 5, 2012

Cataract Surgery & Lens Implant Measurements

Cataract surgery and lens implant measurements at Baltimore Washington Eye Center often involves our cataract surgeons using A Scans and B Scans. When our doctors remove a cataract, they replace the cataract with an intraocular lens implant. The implant is akin to wearing a contact lens, but on the inside of the eye. And, just like contacts lenses, intraocular lenses come in different powers. A critical step in determining the power requires measuring the eye’s length. Historically this was done using ultrasound energy in much the same way ultrasound is used to check on babies during pregnancy. Ultrasound energy can pass harmlessly through tissue to obtain a picture or even measure the length of structures.

Using an ultrasound probe that touches the eye the eye’s length is measured. This is called a contact A scan. In order to improve accuracy, the probe can be placed in a tube filled with a little water. The tube is then placed on the eye. This is called an immersion A scan.

Over the past several years newer methods of measuring the eye with more accuracy and consistently have been developed. Chief among these devices is the IOL Master which relies on light energy rather than ultrasound to measure the length of the eye. Perhaps as important, unlike contact and immersion A scans, the IOL Master scan doesn’t require the probe to touch the eye. This makes the procedure a very simple and more pleasant experience for our patients.

Also, we will have occasion to perform a different type of ocular ultrasound exam called a B Scan. B Scans provided a picture of the inside structures of the eye when certain conditions are present that don’t allow us to see inside a person’s eye(s) with our usual instruments. Such conditions as vitreous bleeding or a very dense cataract are the most common reasons to perform a B scan in our office. By keeping current with the latest in technology we can continue to provide quality eye care for our patients.

If you or someone you know would like to learn more about cataracts, cataract surgery or lens implants they are encouraged to schedule an eye examination at Baltimore Washington Eye Center by calling 800-495-3937, visiting Baltimore Washington Eye Center or

Baltimore Washington Eye Center is a leading eye care practice serving the greater Baltimore and Washington, D.C. area staffed by a team of Ophthalmologists, Optometrists, Opticians, technical and administrative staff who provide eye examinations for adults and children, diagnosis and treatment of cataracts including cataract surgery and intraocular lens implants (IOL), laser vision correction such as LASIK, diagnosis and treatment of cornea disease, care for diseases of the retina including diabetes and age related macular degeneration (AMD) and diagnosis and treatment of glaucoma as well as contact lenses, eyeglasses, eyewear and optical services. Baltimore Washington Eye Center is conveniently located for patients from Arbutus, Carney, Clarksville, Columbia, Dundalk, Edgemere, Essex, Ellicott City, Ferndale, Glen Burnie, Kenwood, Laurel, Linthicum, Lutherville, Millersville, Odenton Owings Mills, Reisterstown, Towson, Parkville, Randallstown, Rivera Beach, Pasadena, Severna Park, South Gate and Woodlawn Maryland.