Glaucoma Services in Thousand Oaks

Lynn Eye Medical Group Thousand Oaks CA 1

Glaucoma is a group of related diseases that damage the optic nerve resulting in vision loss and blindness. Some of the diseases or conditions that contribute to the development of glaucoma include the following:

  • Increased pressure within the eye
  • Severe eye infection
  • Injury to the eye
  • Blocked blood vessels
  • Inflammatory conditions of the eye

Glaucoma is a leading cause of blindness and visual impairment in the United States. Glaucoma can affect patients of all ages. Known as the “sneak thief of sight,” many people affected with glaucoma do not experience any symptoms and may not be aware that they have the disease until they have lost a significant amount of vision. With early detection and treatment, eyes can be protected against the serious loss of vision or blindness.

A new glaucoma treatment is available in Thousand Oaks, and Westlake Village – a device called iStent® – can help lower Intraocular pressure (IOP). Glaucoma Treatment Thousand Oaks | Glaucoma Treatment Westlake Village Typically implanted during cataract surgery, iStent® device can effectively lower IOP, one of the most important risk factors for glaucoma, and may reduce your reliance on glaucoma medication at the discretion of an eye care professional.  Dr. John Davidson and Dr. Wanda Hu are now Certified for use iStent for glaucoma treatment. Read more about iStent®.the assum

Istent is an implantable titanium stent that is FDA approved to be placed at the time of cataract surgery in selected glaucoma patients.  If you are a glaucoma patient considering cataract surgery, ask your doctor if the iStent might be appropriate for you.

Types of Glaucoma

There are several types of glaucoma.

Primary Open-Angle

Primary open-angle glaucoma, or POAG, is the most common type of glaucoma. The fluid in the eye drains too slowly through the network of tiny drainage channels, known as the trabecula. The pressure in the eye increases as the fluid in the eye continues to build. Loss of vision occurs gradually and vision loss is not always noticed until it becomes irreversible. About 95 percent of glaucoma cases are due to open-angle glaucoma.


Angle-closure glaucoma occurs when the tiny drainage channels, known as the trabecula, become blocked which then causes a sudden rise in pressure in the eye. This condition is not common but when it occurs it requires immediate medical attention.

Low Tension

Low tension glaucoma, or LTG, is a form of open-angle glaucoma. LTG occurs when the optic nerve is damaged despite the existing normal level of pressure in the eye. A reduction in the blood supply to the optic nerve may be the cause of this condition.


Congenital glaucoma affects children who have a defect in the angle of the eye that causes the fluid to drain slowly from the eye. With prompt surgery, this condition can be corrected.


Secondary glaucoma develops as a complication from another medical condition such as diabetes, cataract, eye tumor, eye injury or uveitis. Secondary glaucoma may also be the result of previous eye surgery.


Pigmentary glaucoma occurs when pigment from the iris blocks the trabecula, resulting in the slower drainage of fluid.


Pseudoexfoliation glaucoma develops when extra material in the eye blocks the trabecula, resulting in the slower drainage of fluid.

What are the Risk Factors for Glaucoma?

There are several factors that contribute to the risk of developing glaucoma. They include some of the following:

  • Age
  • Ethnicity
  • Family history of glaucoma
  • Myopia
  • Hyperopia
  • Thin corneas
  • Elevated eye pressure
  • Diabetes
  • Low blood pressure
  • Medication
  • Eye injury
  • Eye condition

Symptoms of Glaucoma

Symptoms of glaucoma vary depending on the type of glaucoma. Glaucoma can develop in one eye or both eyes. Some of the symptoms of two types of glaucoma are as follows:


  • Blank spots in the vision that enlarge
  • Loss of peripheral vision
  • Tunnel vision in one or both eyes


  • Severe eye pain
  • Nausea
  • Vomiting
  • Blurry vision
  • Rainbow halos around lights
  • Red eyes
  • Headache

Lynn Eye Medical Group Thousand Oaks CA 2 How is glaucoma diagnosed?

The diagnosis of glaucoma is determined after a comprehensive medical examination of the eye and a review of the patient’s medical history. Tests will be conducted to confirm the diagnosis. Testing may include some of the following:

  • Tonometry
  • Dilated eye examination
  • Visual field test (perimetry)
  • Retinal evaluation
  • Pachymetry
  • Gonioscopy
  • Visual acuity test

Glaucoma Treatment

Once glaucoma has been diagnosed, glaucoma treatment should begin as soon as possible to help minimize the risk of permanent vision loss. There is no cure for glaucoma, so glaucoma treatment focuses on relieving symptoms and preventing further damage. Some of the treatment methods for glaucoma are as follows:


Eye drops or oral medication may be used to either reduce fluid production in the front of the eye or to help drain excess fluid. Side effects of the medication may result in redness, stinging, irritation or blurry vision. Patients should advise their doctor about any medications they are taking or any allergies they have to minimize the risk of side effects. While glaucoma often has no symptoms, regular use of the medication is needed to keep the eye pressure under control.

Laser Surgery

Trabeculoplasty, iridotomy or cyclophotocoagulation are procedures that aim to increase the outflow of fluid from the eye or eliminate fluid blockages through laser, these procedures have shown to be effective in glaucoma treatment.


A trabeculectomy may be used to create a new channel to drain fluid from the eye and reduce the pressure that causes glaucoma. Surgery is performed only after medication and laser procedures have been unsuccessful.

Patient Testimonial

“My family has seen Dr. Hymas for 12 years now. Love him! Best bedside manner, very efficient and truly cares. The aggressive form of glaucoma runs in my husband’s family so a good Ophthalmologist is very important to us. He has also done cataract surgery on my father without any issues and gave us a great recommendation to an eye specialist when my mom needed tubes put into her eyelids for over tearing issues due to chemo.” – Sophia H.

How to prevent glaucoma

There is no way to prevent glaucoma from developing. To prevent glaucoma from progressing, you may want to incorporate some of the following suggestions into your life:

  • Get regular comprehensive eye examinations
  • Get an annual screening for glaucoma
  • Follow doctor-recommended treatment plan
  • Make healthy lifestyle changes
  • Protect eyes from injury

To learn more about our Ophthalmology Services, please contact us today to schedule an appointment!