Keep An Eye On Your Sight When Driving At Night

When nights grow longer, and our morning and evening commute is spent driving in the dark, seeing the road clearly is a much more difficult task.

Driving With Visual Distraction Is Dangerous!

Unfortunately, many people don’t take this fact as seriously as they should. Perhaps they’ve become so accustomed to this type of blurred, haloed vision that they don’t notice it anymore. They simply squint and continue on their way.

Our night vision (especially when driving) can be impaired not only by the darkness, but also by the sudden glares of light from other cars, traffic signals, street lamps, etc. These things force our eyes to constantly adjust, leaving split seconds of impaired vision between adjustments.

Here’s a short video about this topic from Bausch+Lomb and The Canadian Association of Optometrists:

As We Age, This Problem Is More Pronounced

Our eyes sense light with two different types of cells—rods and cones. Rod cells work best in low light. If you’re over 40, this may be more of a problem than it used to be.

Here are three reasons why:

1. We have fewer rod cells, which work to pick up small amounts of light.
2. The lenses in our eyes become stiffer and cloudier.
3. The light receptors on our rods can’t regenerate as fast.

What Can Be Done To Help?

Whatever your age, there are things that can improve your sight at night. Often there are simple adjustments that can be made to your eyeglasses or contacts prescription that help. If you’re concerned about your vision as you drive at night, schedule an appointment with your Vision Source® member optometrist. And of course, if you’re at a point where your night vision is seriously impaired, avoid night driving and plan such activities for the daytime.

Thanks for being our valued patient and friend! Keep safe out there when you’re driving in the dark!

Glaucoma, the Silent Thief of Sight

What is glaucoma?

Glaucoma is a chronic progressive eye disease characterized by a degeneration of the optic nerve. This can lead to serious vision loss if not detected and treated early. The optic nerve takes all of the information the eye sees and transmits that information to the brain. Glaucoma is one of the leading causes of blindness in Canada.

What causes glaucoma?

The exact cause and mechanism of glaucoma is not fully understood. There seems to be some level of mechanical compression and/or decreased blood flow to the optic nerve. Although high eye pressure sometimes leads to glaucoma, many people can also develop glaucoma with “normal” eye pressure, known as normal-tension glaucoma (NTG).

An injury, infection or tumour in or around the eye can cause the pressure inside the eye to rise, leading to a form of glaucoma. These situations are referred to as secondary glaucoma, because their cause is a result of another medical condition.

Who gets glaucoma?

Glaucoma most frequently occurs in individuals over the age of 40, and there is a hereditary tendency for the development of the disease in some families. There is also a greater risk of developing glaucoma when you have diabetes, high blood pressure or a history of eye injuries. Regular eye examinations by a doctor of optometry are important for people of all ages to assess the presence of, or your risk for, glaucoma. Glaucoma cannot be detected without an eye exam.

Why is glaucoma harmful to vision?

The optic nerve, at the back of the eye, carries visual information to the brain. As the fibers that make up the optic nerve are damaged due to increased pressure and/or reduced blood flow to the nerve, the amount and quality of information sent to the brain decreases and a loss of vision occurs. Usually peripheral vision is affected first, followed by central vision during the later stages of the disease.

Will I go blind from glaucoma?

If diagnosed at an early stage, eye drops and laser treatment can control glaucoma and little or no further vision loss should occur. If left untreated, peripheral vision is affected first, followed by central vision loss during late stages of the disease. Complete blindness may occur.

How can I tell if I have glaucoma?

Primary open-angle glaucoma often develops painlessly and gradually. There are no early warning signs. It can gradually destroy your vision without you knowing it. Regular eye exams are important for people of all ages to assess the presence of, or your risk for, glaucoma. Glaucoma cannot be detected without an eye examination. Acute angle-closure glaucoma is a more sudden type of glaucoma and may have warning signs and symptoms such as nausea, eye pain, red eyes, blurred vision and haloes around lights.

How is glaucoma detected?

A comprehensive eye examination is often the only way to detect glaucoma. Your doctor of optometry will perform a simple and painless procedure called tonometry during your routine eye exam, which measures the internal pressure of your eye. Because normal-tension glaucoma causes damage to the optic nerve without eye pressure exceeding the normal rang, it is detected by observing the optic nerve for signs of damage. As part of a comprehensive exam, your doctor will take a detailed look at your optic nerve often through a dilated pupil using a series of hand held lenses. They may also use advanced imaging devices when assessing your optic nerve.

Is all glaucoma detectable?

Normal tension glaucoma is symptomless and can often take years to manifest. Diagnosis of NTG can involve monitoring a patient with standardized eye exam equipment over a number of years, and watching for changes to the optic nerve and/or visual field over time. As part of this testing, your doctor will monitor for signs and symptoms of NTG and refer for the appropriate tests or to the appropriate specialist whenever that is warranted or indicated. Some optometry offices choose to incorporate extended testing in their offices (such as Optical Coherence Tomography, which provides high-resolution, cross-sectional imaging of ocular tissues) to save referral wait times. Other offices will refer for further testing, knowing it is readily available in a colleague’s office (optometrist or ophthalmologist).

How is glaucoma treated?

Treatment of glaucoma will depend on the severity and progress of the disease. It cannot be cured, but rather controlled, often with daily eye drops. Laser surgery is also an effective way to control glaucoma and maintain your remaining vision. In more complicated cases, surgery may be needed to completely bypass the eye’s natural drainage system. Once vision is lost due to glaucoma, it cannot be restored. This is why regular preventive eye exams with one of our Doctors of Optometry are so important.

Don’t Let Your Job Be a Pain

Millions of Canadians are affected by computer eyestrain, a symptom of computer vision syndrome (CVS), according to Dr. Pavan Avinashi.

“March is Eye Safety in the Workplace Month, and as our nation has moved from a manufacturing society to an information society, computer vision syndrome has become a workplace concern,” Dr. Avinashi said. “While prolonged computer use will not damage vision, it can make you uncomfortable and decrease productivity.”

CVS is caused by the eyes constantly focusing and refocusing on the characters on a computer screen. These characters don’t have the contrast or well-defined edges like printed words and the eyes’ focus cannot remain fixed. CVS can be partially alleviated by changes in the ergonomics of the work area.

“Symptoms of CVS include headaches, loss of focus, burning or tired eyes, blurred vision, and neck or shoulder pain,” Dr. Avinashi said. “Proper lighting and monitor placement can go a long way toward reducing CVS, as can giving your eyes frequent ‘breaks’ from the computer. But the underlying cause of CVS – the ability of the eyes to focus on the computer screen – may only be remedied by specialized computer glasses.”

Dr. Avinashi said a comprehensive eye exam, including questions about a person’s computer-use habits, is the first step. If it is determined that vision correction for computer use is required, an eye doctor can prescribe computer lenses that are designed to improve your vision in the 18” to 28” range, the optimal distance between your eyes and the computer monitor.

Dr. Avinashi is the owner and practitioner of Vision Source New Westminster located at #108 - 301 East Columbia Street in New Westminster. For more information, call 604.553.3900 or visit www.visionsourcenw.com.