Contact lenses are a marvel of modern scientific achievement. Eyeglasses have been around since before the Renaissance, which meant a life with lenses sitting on your nose. Although sometimes a nuisance, eyeglasses are not as potentially dangerous as contact lenses are for the health of your eyes.
The convenience provided by contact lenses does not come without a cost. Contact lenses bend light the same way glasses do, except they sit on top of your cornea, covering the ocular surface. Since the surface of the eye needs a constant supply of oxygen for good health, contact lenses present a potential problem.
Contact Lens Prescription
Getting a new contact lens prescription is important to ensure we’re capturing an accurate measurement of a patient’s vision needs.
While an eyeglasses prescription is a helpful guide for a contact lens prescription, the variation in shape of each individual’s eyes is measured for a contact lens prescription. Identifying the necessary lens power to correct for a patient’s farsightedness or nearsightedness is the primary purpose of updating the prescription for contact lens.
Other variations in the shape of the eye are also important for providing a good fit.
Differences between your left eye and right eye sometimes require bifocal contact lens. These multifocal contacts are simultaneously correcting for two refractive errors in the patient’s eyes. Sometimes, these bifocal contacts are too uncomfortable or don’t provide clear vision, so we prescribe monovision contacts. This splits the error correction between the left eye and right eye.
Irregular curvature of the cornea can worsen an already-bad prescription by ineffectively spreading light onto the retina. Corneas like these require corrections for astigmatism (or keratoconus in more severe cases).
With a copy of your prescription, you can also ask for an eyeglasses prescription.
Not all contacts are created the same, though. Technological advances in the manufacturing and efficacy of contact lenses have created more possibilities for many different types of contact lenses. Those types can vary by the materials used or the functional design.
Different Contact Lenses Materials
- Soft contact lenses provide our patients the comfort of a soft, flexible lens. The hydrogel material used gives soft contacts their pliable, comfortable structure. Soft lenses are the most common type of contact lenses material our patients are used to.
- Extended-wear lenses are made of the same material as soft lenses, plus an added silicone element that provides increased breathability and motility. These are known as the overnight contacts since sleeping in them is not potentially harmful for eye health.
- Rigid gas permeable (GP) lenses are made of a hard, plastic material with microscopic holes that allow oxygen (gas) to pass through to the eye. Generally, there are a lot of advantages to wearing GP lenses—like increased breathability, sharper vision, and longer durability—despite the higher cost and discomfort rating.
- Hybrid contact lenses are a combination of the lens of the rigid gas permeable lens with the hydrogel edges of a soft lens. This marriage of the two designs provides for the increased lens breathability with comfort of a soft lens.
Different Lenses Designs
Advances in contact lens technology affect the contact lens design in addition to the materials used. Contact lenses need to fit the lifestyle of the wearer, so
- Daily wear contacts are single-use lenses. Given their specific purpose, they’re one the safest lenses since they require no maintenance or cleaning. Their thinner design and high water content, though, mean the natural build-up of bacteria, lipids, or proteins is less likely.
- Monthly contacts require more maintenance and cleaning than a single-use lenses. The longer-use lenses are thicker in design. Monthly contacts create for more opportunities for mishandling, which can potentially harm a patient’s eyes.
- 2-week contacts find a middle ground in terms of flexibility, cost, and maintenance. With the availability of newer, more breathable materials, 2-week contact lenses are waning slightly.
What Our Complete Contact Lenses Exams Test For
There are numerous health factors covered during our Comprehensive Eye Exam. To ensure proper eye care, our Custom Eyes team
- Vision acuity test
- Cover test
- Internal eye pressure
- Ocular motility for eye muscle capabilities
- Color blindness
- Eye coordination
- Depth perception
- Peripheral vision
- Color vision
- Internal eye pressure
- Ocular refraction
- Responsiveness to light
Fitting Process Contact Lenses
Your new prescription for contact lenses should be a perfect fit for your eyes, your vision, and your life. Our friendly, knowledgeable CustomEyes Team will welcome you to our wonderful clinic. There our expert staff will take a personal medical history of current prescription, medications, and any previous eye or vision conditions. This allows us to tailor a customized contact eye exam to satisfy every patient’s individual needs.