610-628-2022 [email protected]

What Does 20/20 Vision Mean?

Are you Seeing your Best?

How Vision is Measured

 

The distance vision of a normal human eye is defined at 20/20.  This number illustrates what a person with normal vision can see at twenty feet.  Your visual acuity is measured on how it relates to vision at 20 feet.

  • If your vision is 20/40, you can see at 20 feet, what a normal eye can see at 40 feet.
  • If your vision is 20/100, you can see at 20 feet, what a normal eye can see at 100 feet.
  • If your vision is 20/400, you can see at 20 feet, what a normal eye can see at 400 feet.

When you read an eye chart, chances are that person testing you is paying attention to what you say, as well as how you say it. They will know if you are seeing clearly or are struggling and making guesses. It never pays to cheat on your eye test!

Driving vision requirements

Driving requirements

How well do I need to see to drive?  

Although each state determines their specific requirements, generally 20/40 vision is needed to pass the driving test.  If you need glasses to see 20/40, it will be indicated on your driver’s license. While your distance vision is key to passing the driving test, there are other factors that are considered as well.  For complete information on what is required in Pennsylvania, click on the link.

Pennsylvania Drivers Visual Standards

After vision correction surgery, like LASIK or cataract surgery, you may be able to see well enough to have the vision correction restriction removed from your license.

What is legally blind?

If you cannot see any letters below the 20/200 line, even when wearing glasses or contacts, you are considered legally blind.  If your vision can be corrected by putting on a pair of glasses, you may have poor vision, but you are not legally blind.

I see 20/20, do I need an eye exam?

Absolutely!  Measuring your vision is an important part of your comprehensive exam, but there is so much more that we check at your visit. We will check your pupils, eye pressure and field of vision.  We will record your visual history, health history and medications. The doctor will examine the health of your eyes using a slit lamp microscope, checking for eye disease, including glaucoma, macular degeneration, diabetic retinopathy and cataracts.

Early detection of eye disease is your best defense against vision loss.  So even if you don’t need a new pair of glasses, make sure to schedule your regular check-up, so you can keep seeing your best!

 

Why So Many Drops?

 

DROPS, DROPS, when does it stop?

Eye Drops for Exams

Ocular medication for dilating and glaucoma, assorted types

Patients often ask when they come in to see Dr. Moran for a complete exam, diabetic exam  or cataract recheck,  “Why all these drops?”  Here is the simple explanation.

Scared child at dentist

The eye doctor is easier than the dentist!

Getting a comprehensive eye exam without dilation, is like going to the dentist and not opening your mouth. Sure, he can see your lips and the shape of your jaw but he’s unable to see the health of your teeth.

Dr. Moran can examine the lids, lashes, and cornea (outermost layer of your eye), but to see beyond the surface, you need the drops, drops and more drops.

Depending on your age, diagnosis and health history you may receive more drops than another.  Let’s discuss someone in their 60’s with diabetes or cataracts.

First, you will receive the “yellow drop”- No your eyes will not stay that color. This drop will allow us to check the intraocular pressure of your eye (glaucoma screen). It also acts as a mild numbing agent.

Next, you will receive a Phenylephrine drop. This is the drop which will dilate your pupil and allow Dr. Moran to see into the depths of the eye and examine the retina.

Lastly, comes the Mydriatic drop which paralyzes the iris muscle to keep the eye dilated for the duration of the examination.

That’s the answer to why all the drops. Now when will it STOP?

Usually, dilation lasts from 4-6 hours. It will affect your ability to work close-up and you will be sensitive to light. Blue eyes tend to stay dilated longer. It is not unusual for some patients to remain dilated for more than 6 hours, but dilation is not harmful to the eye.

You can drive if you are comfortable doing so. We recommend dark sunglasses and will provide you with them if you forget to bring yours.

Although being dilated can be an inconvenience, the benefit significantly outweighs the hassle.

Schedule your DILATED eye examination by calling or texting our office at 610-628-2022, we look forward to seeing you.

Contributed by Mandy Bolton, COA