Eye Center of Texas Blog

What is a Cataract Evaluation?

Have you ever wondered how the doctors determine if you have a cataract?  At Eye Center of Texas cataracts are detected through a comprehensive cataract evaluation eye exam that may include the following tests:

  • Visual Acuity: A visual acuity test measures your quality of vision at certain distances. Your doctor will ask you to read letters of various sizes from a chart. Your eyes will be tested individually and together to measure the accuracy of your eyesight at different distances. A visual acuity test is an easy, painless, and quick way to diagnosis cataracts, although more tests will be needed to make sure cataracts are the cause of your vision problems.
  • Contrast Sensitivity: Contrast sensitivity testing is similar to visual acuity testing but places greater emphasis on how cataracts can decrease image contrast due to light scattering and glare caused by the cataract. Eye doctors consider contrast sensitivity testing to be a more realistic measurement of true quality of vision.
  • Slit Lamp: A slit lamp is a special type of microscope that magnifies your eye so your doctor can examine the lens to determine the presence and severity of a cataract. Your doctor will ask you to place your chin on the chin rest of the slit lamp. A light will then be directed at your eye. By looking through the slit lamp, your doctor can examine the lens to determine the degree to which it is clouded.
  • Pupil Dilation: Pupil dilation is a common test used in diagnosing cataracts. Clouding of the lens is not noticeable until a cataract reaches an advanced stage. When your eye is dilated, however, the pupil increases in size, offering a view of your entire lens. By thoroughly examining the lens, a doctor can determine whether or not a cataract is affecting your quality of vision.

Additional tests may be needed and cataract evaluations take between 3-4 hours.

Share This Post

Our Locations


6565 W. Loop S. Suite 650

Bellaire, TX 77401

Medical Office: 713-797-1010

Medical Fax: 713-357-7276

LASIK/ReSTOR: 713-395-1515

LASIK/ReSTOR Fax: 713-357-7278


4415 Crenshaw Road

Pasadena, TX 77504

Medical Office: 281-977-8800

Medical Fax: 281-977-8877

Sugar Land

15400 S.W. Freeway, Suite 301

Sugar Land, TX 77478

Medical Office: 281-277-1010

Medical Fax: 281-277-4504

Clear Lake

455 E. Medical Center Blvd., Suite 110

Webster, TX 77598

Medical Office: 281-332-1397

Medical Fax: 281-338-1215


Kingsland Medical Plaza 777 S. Fry Road Suite 102

Katy, TX 77450

Medical Office: 713-797-1010

Medical Fax: 713-357-7276

The Woodlands/Conroe

Park Place Professional Building 100 Medical Center Blvd Suite 118

Conroe, TX 77304

Medical Office: 713-797-1010

Medical Fax: 713-357-7276