The visual field test checks the range of your peripheral vision by measuring the ability to see pinpoints of light that flash inside the testing globe. The device measures the area that you can see up/down/left/right while the patient focuses straight ahead.
What is the visual field test used for?
- Glaucoma Screening & Evaluation: Loss of peripheral vision is often an early sign of glaucoma. We repeat this test once a year so the doctor can evaluate treatment plans and the progression of the disease.
- Lid Drooping (Ptosis): If your eyelids have started to droop, the visual field can see if you have any loss of vision due to the drooping lid.
- Effects of Medication: We can also test for effects of medications, such as plaquenil, which can affect the central retina.
- Optic Nerve Conditions: The visual field can help evaluate your vision affected by stroke, optic neuropathy, tumors and injury.
What is a normal visual field?
The definition of a visual field is the space or range in which objects are visible to eyes that are fixed in place, focused on an object.
The normal human visual field extends to approximately:
- Inward: 60 degrees nasally
- Outward: 100 degrees temporally
- Up: 60 degrees above
- Down: 75 degrees below
Taking the test:
The testing device is a large globe or bowl, with pinpoints of light that flash on and off during the test. Patients press a button each time they see a light flash inside the globe. The lights flash in varying patterns and different levels of brightness. It’s kind of like a video game!
During the test, the patient is asked to focus on an amber light directly in front of them, so that we can accurately measure the range of vision all around. We test one eye at a time, so the eye that is not being tested is covered with an eye patch. The test takes about 5-8 minutes per eye. Testing time can vary from patient to patient.
If you have questions about any of the tests that we do, please ask us in person, text or send us an email! We are happy to explain how we use each device to better care for your vision.
As you look into through the bright red colored rings, the topography machine creates a map of the clear front portion of your eye, the cornea. Corneal topography allows us to detect irregular conditions of the surface that can’t be measured in other ways.
How does a map of the cornea help us evaluate your vision?
A healthy cornea is very important to your vision, because 77% of the eye’s focusing ability is done by the cornea. Light enters the eye through the clear cornea. The shape and curve of the cornea plays an important role in the quality of vision. An eye with normal vision has an evenly rounded cornea, like a basketball. An eye with an astigmatism has an unevenly curved cornea, more like a football.
Corneal topography is performed by projecting lighted rings onto the surface of the eye. These rings are reflected back and measured by the instrument, and a map of the cornea is created.
Topography is an important tool in measurements for LASIK Surgery. LASIK surgical correction changes the shape of the cornea to help patients see more clearly. During LASIK, the shape of the cornea is changed to help images focus properly on the retina. Below you can see how the shape of the eye is changed with the laser after LASIK surgery. The photos show the same eye before and after LASIK.
Corneal Topography is just one of the testing resources that we use when treating our patients. You can trust Moran Eye Associates to use the tools that we need to keep your eyes healthy, and your vision the best it can be. If you have questions about your vision, contact Moran Eye Associates. We focus on making vision clearer.
What is the first test we do when you come into the office for a complete vision exam?
We take a measurement of your vision with the AutoRefractor.
When you take a seat at the autorefractor, we ask you to look into the device. You will see a blurry hot air balloon at the end of a long straight road. As the balloon comes into focus, we measure your prescription.
We ask you to focus on the image (balloon) to keep your eye centered while we take measurements. It only takes just a few seconds to measure using an autorefractor. The balloon is at the center of the image, which aligns your eye perfectly for the test.
When we use this machine, nothing touches your eye, and there is no puff of air!
The autorefractor provides an objective measurement of a person’s refractive error and prescription for glasses or contact lenses. The device measures how light is changed as it enters your eye.
We don’t use the numbers from the device to order your prescription glasses or contacts. The autorefractor is just part of the process. The information from the autorefractor is used as a starting point to determine your best prescription. We take these numbers and dial them into the phoropter.
Here is where your opinion comes in. As we cycle through lenses, we ask, “Is it Better 1 or Better 2?” Your responses help us to pinpoint your best vision. When we show you different choices, we aren’t trying to trick you! We are showing you different options to find your best correction.
Why do we use a balloon photo?
The image isn’t important, but the need to focus on something at a distance is key to a good measurement. The balloon is just one of many visual targets used in the autorefractor. Besides the hot air balloon, other popular images include: a pinwheel/peppermint candy, a house (or barn) at the end of a road, a house in the middle of a field.
Patients often ask…what happens at the LASIK Center?
Our LASIK surgery center is just off of Schoenersville Road in Bethelehem. Although we do our surgery at a separate facility, our office staff is there with Dr. Moran, so you will see familiar faces!
When you arrive at the LASIK Center, you are greeted by one of our staff members. Your family member or friend can stay with you while we review your paperwork, medications and post-op instructions – it’s always good to have an extra pair of ears listening while we go over details! The total time at the laser center is usually under 1 hour.
Next, we get you ready for surgery. We apply a series of eye drops and review what happens in the laser suite. During the procedure, Dr. Moran explains each step of the way, so you know what to expect.
In the LASIK Suite
- The team makes you comfortable on the surgery bed. Your head rests on a horseshoe shaped pillow.
- We place a patch on your left eye.
- Then, your right eye is held open with a lid holder (no need to worry about blinking during the procedure!).
- Dr. Moran creates a flap using the Intralase laser. You will feel some pressure as he applies a ring on your eye, before the laser is applied. Your vision will go dark for a few seconds as he creates the flap. In just a few seconds, the flap is done! Your vision comes right back after the ring is removed.
- Next, he lifts the flap and centers your eye under the Visx laser.
- The laser treatment is applied. It is painless…all you need to do is look at a yellow light while the laser is working.
- Then, he smoothes the flap back into place and the lid holder is removed. The right eye is done!
- Dr. Moran repeats the procedure in the left eye.
When you enter the LASIK room, Dr. Moran, his surgical assistant, and the laser engineer are waiting for you. They give you a LASIK buddy to hold…he’s a little bit of comfort that goes a long way to making you feel secure!
After about 15-20 minutes, Dr. Moran walks you out of the LASIK room. You’ll be able to see us waiting for you in the hallway! We put drops in your eyes before you head home, and review the post-op instructions again. Once you put on your sunglasses, you are good to go.
At the surgery center, we have a room with closed circuit tv screens. If your companion wants to watch and record the procedure, we will sit with them and explain what is happening. If they don’t want to watch, (no pressure!) they can wait for you in the waiting room.
WHEN YOU GO HOME:
The day of your surgery, it is important to keep both eyes closed as much as possible. We give you sunglasses to wear home, so you can open your eyes to walk to the car. Close your eyes for the ride home, but you can open them again to walk into your house.
Put on your eye shield as soon as you arrive at home. Then it is time to rest with your eyes closed. Listen to music, an audiobook, or podcast…or just go to sleep. The eye shields should be worn for sleeping for the next 7 days, so that you don’t accidentally touch or rub your eyes.
If you have questions once you are home, call us! We always have someone on call to answer our patients concerns.
WHAT OUR PATIENTS SAY
Overwhelmingly, our patients comment about how fast the procedure was…and how easy! We most commonly hear, “That was so much easier than I expected, why did I wait so long!?!”
Interested in LASIK? Come in for a free consultation to find out if LASIK is right for you. Click to find out what happens at your LASIK Consult
Dr. Moran attends Surgical convention to Learn…and to TeacH
At this year’s annual conference of the American Society of Cataract and Refractive Surgeons (ASCRS), Dr. Moran was the speaker at two education sessions. He spoke to other physicians and practice administrators at these workshops.
An experienced cataract surgeon, Dr. Moran instructed fellow surgeons on a procedure that he uses when removing cataracts: phaco-emulsification. This process uses an ultrasound device to break the cataract into small pieces that can be removed through a small incision. A smaller incision means quicker healing and less discomfort for the patient.
This hands-on lab allowed other surgeons to practice the process while receiving instruction from Dr. Moran, Dr. Harvey and Dr. Reeves. (pictured here).
Also at the conference, Dr. Moran also gave a presentation on Cybersecurity. He is well-versed on the topic of technology in healthcare, with a Masters Degree in Healthcare Informatics. This topic is critical for medical offices today, since keeping patient information secure is a priority. This session was co-chaired with Dr. Gerald Meltzer, who is a practice consultant.