Screen Time Pros and Cons

Whether it is homework, email, gaming, chatting with friends, searching the web or watching Youtube, kids these days seem to have an endless number of reasons to be glued to a screen. Many parents out there are wondering how bad this can be for their kids and whether they should be limiting screen time.

There are certainly benefits to allowing your kids to use digital devices, whether it is educational, social or providing a needed break. However, studies show that excessive screen time can have behavioral consequences such as irritability, moodiness, inability to concentrate, poor behavior, and other issues as well. Too much screen time is also linked to dry eyes and meibomian gland disorders (likely due to a decreased blink rate when using devices), as well as eye strain and irritation, headaches, back or neck and shoulder pain, and sleep disturbances. Some of these computer vision syndrome symptoms are attributed to blue light that is emitted from the screens of digital devices.

Blue light is a short wavelength, high-energy visible light that is emitted by digital screens, LED lights and the sun. Studies suggest that exposure to some waves of blue light over extended periods of time may be harmful to the light-sensitive cells of the retina at the back of the eye. When these cells are damaged, vision loss can occur. Research indicates that extreme blue light exposure could lead to macular degeneration or other serious eye diseases that can cause vision loss and blindness. Studies show that blue light also interferes with the regulation of the the body’s circadian rhythm which can have a disruptive impact on the body’s sleep cycle. Lack of quality sleep can lead to serious health consequences as well.

Beyond these studies, the long term effects of blue light exposure from digital devices are not yet known since this is really the first generation in which people are using digital devices to such an extent. While it may take years to fully understand the impact of excessive screen time on our eyes and overall health, it is probably worth limiting it due to these preliminary findings and the risks it may pose. This is especially true for young children and the elderly, who are particularly susceptible to blue light exposure.

How to Protect the Eyes From Blue Light

The first step in proper eye protection is abstaining from excessive exposure by limiting the amount of time spent using a computer, smart phone or tablet – especially at night, to avoid interfering with sleep. Many pediatricians even recommend zero screen time for children under two.

The next step would be to reduce the amount of blue light entering the eyes by using blue light blocking glasses or coatings that deflect the light away from the eyes. There are also apps and screen filters that you can add to your devices to reduce the amount of blue light being projected from the screen. Speak to your eye doctor about steps you can take to reduce blue light exposure from digital devices.

As a side note, the sun is an even greater source of blue light so it is essential to protect your child’s eyes with UV and blue light blocking sunglasses any time your child goes outside – even on overcast days.

The eyes of children under 18 are particularly susceptible to damage from environmental exposure as they have transparent crystalline lenses that are more susceptible to both UV and blue light rays. While the effects (such as increased risk of age-related macular degeneration) may not be seen for decades later, it’s worth it to do what you can now to prevent future damage and risk for vision loss.

What Is Progressive Myopia?

Nearsightedness or myopia is one of the most prevalent eye disorders worldwide and its incidence is increasing. In fact by 2050, myopia is projected to affect half of the world’s population!

Many children diagnosed with nearsightedness (myopia) experience a consistent worsening of their vision as they grow into adolescence. This condition can be so aggressive that for some, each time they take their child to the eye doctor for a vision checkup, their prescription gets higher.

This is called progressive myopia and can be a serious condition for many children now and in the future. Not only is there a financial burden and inconvenience associated with having to replace eyeglasses on a regular basis, but high myopia is a risk factor for many eye diseases later in life such as retinal detachment, early onset cataracts, glaucoma and macular degeneration.

What Causes Progressive Myopia?

Myopia is a refractive error that happens when the eye focuses incoming light in front of the retina, rather than directly on it, resulting in blurred distance vision. While an exact cause of progressive myopia is not known, most research indicates that a combination of environmental and genetic factors trigger the condition.

First of all, there is evidence that a family history of nearsightedness is a contributing factor. Additionally, spending a lot of time indoors may play a role in myopia development, as studies show that children who spend more time outside have less incidence of myopia. Lastly, near point stress, which can be caused from looking at a near object for an extended period of time, can prompt the eye to grow longer and result in myopia. Several eye doctors recommend following the 20-20-20 rule when using digital devices (stopping every 20 minutes to look 20 feet away for 20 seconds) to reduce near point stress caused by computer use.

What Can Be Done To Prevent or Treat Myopia?

There are several treatments that have been shown to slow the progression of myopia.

Orthokeratology (ortho-k):

Also known as corneal reshaping, this treatment uses rigid gas permeable contact lenses that are worn while the patient sleeps to reshape the cornea, which is the clear, front part of the eye. During the day, the patient is usually able to see clearly, glasses-free. In addition to allowing glasses-free vision during the day, this treatment has been shown to reduce the progression of myopia in many children.

Distance Center Multifocal Contact Lenses:

This treatment uses distance center (which means the area for seeing at a distance is in the center of the lens) multifocal soft contact lenses to provide clear vision and slow the progression of myopia. The lenses are worn as normal contact lenses during the day.

Atropine Drops:

Atropine drops are a daily-use prescription eye drop that has been shown to reduce myopia progression. It can be used alone or in combination with ortho-k or multifocal contact lenses.

Additional Myopia Treatments:

While these treatments are available in all of North America, some countries offer additional options that are approved for myopia control. For example, in Canada, Zeiss^TM MyoVision glasses that have an innovative lens curvature design are available to help reduce the rate of myopia progression. Additionally some doctors in Canada offer Coopervision MiSight^® lenses, which are 1-day contact lenses that are worn during the daytime. These contacts have a multifocal lens design with distance centre and near surround that is specifically designed for children.

Myopia & Your Child

If your child’s vision keeps getting worse, it’s more than an annoyance – it can be a serious risk factor for their eye health and vision in the future. The best strategy for myopia control depends on the child and the severity of the case, and requires consultation with an experienced eye doctor in order to determine the best solution. If your child wears glasses, make his or her vision a priority; schedule an eye exam to ensure stable vision and healthy eyes.

Healthy eyes and good vision are essential for your child’s growth and development. In fact, learning is 80% visual, which means a child’s success in school, athletics and many other aspects of life can be impacted by poor vision. Good vision goes beyond how far you can see, and also includes a number of other skills such as visual processing and eye movement abilities.

Often times vision deficiencies are at the root of learning problems and behavioral issues and may unfortunately go unchecked and misdiagnosed. Remember, if your child is having trouble in school, an eye exam and a pair of prescription glasses is a much easier solution than treating a learning disorder or ADHD; yet many people fail to check that first.

It is common for children to think that their vision deficiency is normal and therefore they often won’t report it to parents or teachers. That is why it is even more important to know what to look for. Here are some signs that your child may have a vision problem:

Vision Signs

• Squinting or blinking often
• Eye rubbing
• Tilting the head to the side
• Covering one eye
• One eye that turns out or in
• Reporting double vision
• Holding books or reading materials very close to the face

Behavioral Signs

• Complaining of headaches or eye fatigue
• Short attention span
• Difficulty reading
• Losing their place frequently when reading
• Avoiding reading or any activity that requires close work
• Problems with reading comprehension or recall
• Behavioral issues that stem from frustration and/or boredom
• Poor performance and achievement in school or athletics
• Working twice as hard to achieve minimal performance in school

Another issue is that many parents and teachers think that a school vision screening is sufficient to assess a child’s vision, so if that test comes back okay, they believe there is no vision problem. This however, is far from the case. A school vision test usually only assesses visual acuity for distance vision or how far a child can see. Even a child with 20/20 vision can have significant vision problems that prevent them from seeing, reading and processing visual information.

Every child of school age should have comprehensive eye and vision exams on a regular, yearly basis to assess their eye and vision health, and ensure that any issues are addressed as soon as possible. It’s also important to have an exam prior to entering kindergarten, as undetected lazy eye may be more complicated to treat past seven years of age.

Some of the issues the eye doctor may look for, in addition to good visual acuity, are the ability to focus, eye teaming and tracking, visual perception, hand-eye coordination, depth perception and peripheral vision. They will also assess the health of the eye and look for any underlying conditions that may be impairing vision. Depending on the problem the eye doctor may prescribe eyeglasses, contact lenses or vision therapy to correct the issue.

During the school years a child’s eyes and vision continue to develop and change so it is important to continually check in on your child’s vision. If you have a family history of vision problems, follow-ups are even more important. Progressive conditions like progressive myopia, strabismus (crossed eyes), amblyopia (lazy eye) or astigmatism can be treated and monitored for changes with early treatment so it’s important to seek a doctor’s diagnosis as soon as signs or symptoms are present.

Make sure that your child has the best possible chances for success in school and add a comprehensive eye exam to your back to school to-do list.