TearLab aids in the accurate and early detection of dry eye disease, one of the most under-diagnosed ocular diseases.

Stable Vision

A healthy tear film and ocular surface are essential to stable vision. Tears form an important film over the ocular surface and the health of these tears directly impacts the health of the ocular surface.

Dry Eye Disease

Dry eye disease occurs when your eyes do not produce enough tears or enough quality tears to lubricate and nourish the eye. This is often due to a disruption in one or more layers of your tear film. Learn More

Symptoms of Dry Eye Disease

Unfortunately, many people mistake the symptoms of dry eye disease for allergies, climatic conditions, or eyestrain. While all of these may aggravate dry eye symptoms, they are not the cause.

Symptoms of dry eye disease may include:

  • Blurry Vision
  • Redness
  • Burning
  • Itching
  • Light Sensitivity
  • Excessive Tearing / Watery Eyes
  • Tired Eyes / Eye Fatigue
  • Stringy Mucous in or Around the Eye
  • Foreign Body Sensation
  • Contact Lens Discomfort
  • Scratchy Feeling of Sand or Grit in Eye

Dry eye is a multifactorial disease of the tears and ocular surface that results in symptoms of discomfort, visual disturbance, and tear film instability with potential damage to the ocular surface. It is accompanied by increased osmolarity of the tear film and inflammation of the ocular surface.


When your eyes do not produce enough tears or produce poor quality tears, it is essential to get your tears analyzed by your eye doctor. Only an eye doctor can properly diagnose your problem and treat it appropriately.

Your eye doctor will take a sample of tears from each eye and use the TearLab device to measure osmolarity (the saltiness of your tears). The amount of tear fluid needed is no larger than the period at the end of this sentence. As osmolarity in your tears increases, ocular surface cells become damaged.

Watch this educational video to learn more about osmolarity and the TearLab test.

How It Works

The TearLab Osmolarity Test Card, in conjunction with the TearLab Osmolarity System, provides a quick and simple method for determining tear osmolarity using nanoliter (nL) volumes of tear fluid collected directly from the eyelid margin. The Test Card is held by the Osmolarity Test Pen, for safe collection.

Diagnosing Dry Eye Disease with TearLab Testing

During your appointment, your eye doctor will review your symptoms with you and ask you to complete an Ocular Surface Health Questionnaire. Your eye doctor will then perform a TearLab test to determine your osmolarity. TearLab aids in the accurate and early detection of dry eye disease. If you are diagnosed with dry eye disease, your eye doctor will determine which treatment is best based on your individual circumstances.

TearLab Osmolarity Testing Available at FSN Eye Center

Contact FSN Eye Center at (815) 932-2020 to schedule a TearLab Testing appointment. Proper diagnosis is the first step toward relief. For your convenience, you may also request an appointment online.