Contact Lens Exam and Fitting

Because contact lenses are medical devices, a contact lens exam is required in Pennsylvania before prescribing any contacts.  Your optometrist will make sure that your vision examination for your prescription involves finding the correct fit and solution for your contacts.

For contact lens wearers, a contact lens exam is absolutely necessary to ensure the lenses are fitting both eyes properly and that the health of your eyes are not harmed by contact lenses. For example, not everyone's eyes make enough tears to even wear contact lenses.  We will consult with you about your lifestyle, e.g., if you are involved in a lot of sports, etc. and will involve measurements.

Your contact lens exam assesses the curvatures of the eye, evaluates the cornea and eyelids in relationship to the contacts as well as the movement of the lens on the eye. This exam also determines your contact lens prescription, because it is not the same as the glasses prescription.Patients need to be careful to get a proper fit, and also learn how to clean and store them safely. Getting contacts from an eye care doctor, complete with a special exam, is the way to go, not through mail order.

The first test will measure your eye surface to determine what size and type of contacts are best for you. Your doctor may also do a tear film evaluation to make sure you have enough tears to comfortably wear contacts.

With the results of those tests, we provide a contact lens prescription that is the right fit for your eyes. An eyeglass prescription is no substitute for a contact lens exam because the two are very different. An eyeglass prescription measures for lenses that are positioned approximately 12 millimeters from your eyes; whereas a contact lens prescription measures for lenses that sit directly on the surface the eye. An improper fitting or prescription of contacts can damage your eye health.

Contact Lens Exam

• Measures curvature of cornea, your eye’s clear top surface
• Evaluates the cornea for abnormalities that are specifically related to contact lens wear including corneal edema, corneal infiltrates, corneal neovascularization, and endothelial cell loss.
• Assessescornea for signs of improper contact lens fitting
• Measures cornea diameter and compare to current contact lens diameter to determine if any adjustment in lens size is needed
• Analyzes corneal surface curvature as well as the amount and axis of astigmatism to see if any change in contact lens base curvature is warranted
• Measure pupil and iris size
• If you have dry eyes, we may also perform a tear film evaluation to make sure you are prescribed contact lenses that keep your eyes sufficiently moist. 

Once you have the correct fit and prescription for contacts, Wohl Optics will help you decide whether you want disposable contacts or extended wear, and if you want your contacts to be colored.