Eye Exams for Contact Lenses
Contact lenses are a great alternative to wearing eyeglasses. An often unknown fact is that not all patients wear contact lenses as their primary source of vision correction. Each patient is different, with some patients wearing contact lenses only on weekends, special occasions or just for sports. That is the beauty of contact lens wear, the flexibility it gives each individual patient and their lifestyle.
If you decide to opt for contact lens wear, it is very important that the lenses fit properly and comfortably and that you understand contact lens safety and hygiene. A contact lens exam will include both a comprehensive eye exam to check your overall eye health, your general vision prescription and then a contact lens consultation and measurement to determine the proper lens fit.
Every contact lens exam includes a LipiScan.
While a standard contact lens exam can assess the proper fit and prescription, some conditions that can lead to contact lens discomfort require advanced digital imaging. Meibomian glands produce essential lubricating oils to help keep your eyes moist and protected, yet when they are blocked, this may lead to contact lens discomfort. Knowing why a contact lens patient faces dry eye symptoms can show our eye doctors the reasons behind your contact lens don't feel quite right. Aside from when we diagnose dry eye patients, we also use the LipiScan, which takes a high-resolution digital image of the lower AND upper glands for all of our contact lens patients as well.
How does the LipiScan solve Contact Lens discomfort?
The surface of the eye, called the cornea, relies on a layer of moisture to protect itself from foreign bodies or particles that could cause irritation or possible damage. This layer of moisture is composed of oils and various nutrients to support your eye’s health and remain on the cornea. However, when your tear glands fail to produce the right balance of moisture or not enough moisture, this can lead to irritation, redness, or dry eye syndrome.
While many contact lens companies aim to develop breathable contacts that preserve this layer of moisture, unfortunately, bad habits like contact lens overuse can still cause dry eye symptoms. Plus, not all contact lenses are composed of high quality material, which may reduce the amount of oxygen that reaches the cornea. Over time, this lack of oxygen can ruin the tear film around the cornea, forcing overwork your tear glands to compensate for the lack of moisture, and result in dry eye symptoms.
If you have ever felt that your contacts:
- Make you rub your eyes often
- Made you start eye drops to reduce redness
- Cause irritation or pain
Through your contact lenses, you may have developed dry eye syndrome.
At Perimeter Eye Group, we evaluate all of our contact lens patients using the LipiScan. This advanced technology can diagnose the health of your eye glands and surrounding eyelids to assess whether your choice of contact lenses are causing discomfort. Not only can we guide you on improving the health of your eyes, but, with the right guidance, you can start to fully enjoy wearing contact lenses without the annoying symptoms.
The Importance of a Comprehensive Eye Exam
Whether or not you have vision problems, it is important to have your eyes checked regularly to ensure they are healthy and that there are no signs of a developing eye condition. A comprehensive eye exam will check the general health of your eyes as well as the quality of your vision. During this exam the eye doctor will determine your prescription for eyeglasses, however, this prescription alone is not sufficient for contact lenses. The doctor may also check for any eye health issues that could interfere with the comfort and success of contact lens wear.
Hard To Fit Contact Lens Patients
Even if you've been told you can't wear contact lenses, we may be able to help. Specialty contacts are available for patients with dry eyes, severe astigmatism and more.
The Contact Lens Consultation
The contact lens industry is always developing new innovations to make contacts more comfortable, convenient and accessible. Therefore, one of the initial steps in a contact lens consultation is to discuss with your eye doctor some lifestyle and health considerations that could impact the type of contacts that suit you best.
Some of the options to consider are whether you would prefer daily disposables or monthly disposable lenses, as well as soft versus rigid gas permeable (GP) lenses. If you have any particular eye conditions, such as astigmatism or dry eye syndrome, your eye doctor might have specific recommendations for the right type or brand for your optimal comfort and vision needs.
Now is the time to tell your eye doctor if you would like to consider colored contact lenses as well. If you are over 40 and experience problems seeing small print, for which you need bifocals to see close objects, your eye doctor may recommend multifocal lenses or a combination of multifocal and monovision lenses to correct your unique vision needs.
Contact Lens Fitting
One size does not fit all when it comes to contact lenses. Your eye doctor will need to take some measurements to properly fit your contact lenses. Contact lenses that do not fit properly could cause discomfort, blurry vision or even damage the eye. Here are some of the measurements your eye doctor will take for a contact lens fitting:
In order to assure that the fitting curve of the lens properly fits the curve of your eye, your doctor will measure the curvature of the cornea or front surface of the eye. The curvature is measured with an instrument called a keratometer to determine the appropriate curve for your contact lenses. If you have astigmatism, the curvature of your cornea is not perfectly round and therefore a “toric” lens, which is designed specifically for an eye with astigmatism, would be fit to provide the best vision and lens fit. In certain cases your eye doctor may decide to measure your cornea in greater detail with a mapping of the corneal surface called corneal topography.
Pupil or Iris Size
Your eye doctor may measure the size of your pupil or your iris (the colored area of your eye) with an instrument called a biomicroscope or slit lamp or manually with a ruler or card. This measurement is especially important if you are considering specialized lenses such as Gas Permeable (GP) contacts.
Tear Film Evaluation
One of the most common problems affecting contact lens wear is dry eyes. If the lenses are not kept adequately hydrated and moist, they will become uncomfortable and your eyes will feel dry, irritated and itchy. Particularly if you have dry eye syndrome, your doctor will want to make sure that you have a sufficient tear film to keep the lenses moist and comfortable, otherwise, contact lenses may not be a suitable vision option.
A tear film evaluation is performed by the doctor by putting a drop of liquid dye on your eye and then viewing your tears with a slit lamp or by placing a special strip of paper under the lid to absorb the tears to see how much moisture is produced. If your tear film is weak, your eye doctor may recommend certain types of contact lenses that are more successful in maintaining moisture.
Contact Lens Trial and Prescription
After deciding which pair of lenses could work best with your eyes, the eye doctor may have you try on a pair of lenses to confirm the fit and comfort before finalizing and ordering your lenses. The doctor or assistant would insert the lenses and keep them in for 15-20 minutes before the doctor exams the fit, movement and tear in your eye. If after the fitting, the lenses appear to be a good fit, your eye doctor will order the lenses for you. Your eye doctor will also provide care and hygiene instructions including how to insert and remove your lenses, how long to wear them and how to store them if relevant.
Your eye doctor may request that you schedule a follow-up appointment to check that your contact lenses are fitting properly and that your eyes are adjusting properly. If you are experiencing discomfort or dryness in your eyes you should visit your eye doctor as soon as possible. Your eye doctor may decide to try a different lens, a different contact lens disinfecting solution or to try an adjustment in your wearing schedule.
Contact us today to schedule your contact lens exam and fitting.