Contact Lenses

Types of Contact Lenses

Wearing contact lenses gives patients the flexibility and freedom to live life to the fullest, without some of the difficulties presented by wearing glasses. Many people who choose contact lenses do so because they don’t like the way that glasses look or feel, or because wearing glasses compromises their ability to perform certain tasks or activities, such as sports or jobs that require the use of safety goggles.

Disposable Lenses

As their name suggests, these daily contact lenses are disposable. This means that they can and should be discarded at the end of each day rather than re-worn. Disposable lenses do tend to be a little more expensive than some repeat-wear varieties, but the benefits usually outweigh the cost.

Some of the advantages of choosing daily disposable contact lenses include:

• You don’t have to clean them, which saves patients a great deal of time and hassle. It also helps save money in terms of the ongoing cost of cleaning solution.

• Disposable lenses are also great for people with eye allergies. This is because with ordinary lenses, there’s an opportunity for deposits and microorganisms to build up. With daily disposables, allergens have less chance to attach themselves to the lenses and cause irritation and other allergy symptoms.

• You don’t need to schedule regular replacements either, which makes wearing contact lenses easier on your schedule.

• Disposable contact lenses are particularly good for people who have busy lives and are likely to cut corners when it comes to caring for their eyes or contacts since there is no cleaning or maintenance required.

Daily disposable contact lenses are available in a wide range of prescriptions, including those for patients with nearsightedness and farsightedness. Your eye doctor will be able to advise you if you are a candidate for disposable contact lenses.

Toric Lenses

Toric contact lenses are recommended for patients who have a refractive eye problem called astigmatism. Patients with astigmatism have corneal abnormalities that cause the refraction of the eye to be different between the vertical and horizontal planes, causing blurred vision and difficulty seeing fine details. Toric contact lenses are shaped in a particular way that creates the different focusing powers needed in each part of the lens to correct your vision. For this reason, it’s essential that Toric lenses are placed into the eyes in the correct position.

Fortunately, manufacturers design Toric lenses with features that help them to stay in place, including:

• Thin/thick zones

• Creating areas of the lens that are thicker or heavier which helps secure it in position

• An area where the bottom of the lens is slightly cut off

To keep them stable, Toric lenses are a little firmer than conventional soft lenses. This means that some patients can find them a little less comfortable, but the superior vision they obtain outweighs this. Your eye doctor will be able to advise you if you are a good candidate for Toric contact lenses and which variety would best suit you.

Rigid Gas-Permeable Lenses

Also known as RGP lenses, these are made from a special material that allows oxygen to pass through them and reach the surface of the eyes. This helps to keep the eyes hydrated and comfortable, making these lenses easier to wear, especially for patients who suffer from dry eyes. Dry eyes aren’t just a symptom, but a very real condition, characterized by dry, stiff, and uncomfortable eyes, blurred vision, and eye fatigue. RGP lenses are more rigid than soft lenses, and this helps to keep them stable and secure on the eyes so that patients can enjoy sharper vision. They also help the cornea to maintain its shape, which helps to minimize the effects of some corneal abnormalities.

Scleral Contact Lenses

Scleral contact lenses are very different to standard contact lenses. This is because scleral lenses are much larger in diameter, with three different sizes available depending on your specific needs. This size difference means that the edges of the contact lens fall on a white part of the eye, called the sclera rather than the cornea. Scleral lenses are also different in that they vault over the surface of the cornea rather than touching it, leaving a space between the front surface of the eye and the back of the contact lens. This makes scleral lenses a good choice for patients with dry eyes and corneal abnormalities. Space can trap tear film which keeps the eyes hydrated, while space also accommodates many corneal abnormalities, such as the bulge associated with keratoconus.

Limbal Fit Contact Lenses

Limbal contact lenses are another type of specialty lens that falls between rigid gas-permeable lenses and scleral varieties in terms of their size. Their larger overall diameter helps to increase their stability on the surface of your eyes. They also offer minimal interference with the eyelids, which helps to ensure comfort and clarity of your vision.

Hybrid Contact Lenses

Hybrid contact lenses are a combination of both soft and gas-permeable contact lenses, giving patients the opportunity to enjoy the best parts of both designs. The middle part of hybrid lenses is made from gas-permeable material that lets oxygen pass through to the eyes. However, the gas-permeable part of the lens is more rigid, and this firmer center gives the lens greater stability and the patient enhanced clarity. The RGP portion of the lens also helps to trap a tear film between the cornea and the lens so that the eye remains hydrated. Meanwhile, the outer edge of hybrid lenses is a soft lens skirt. This means that patients don’t have to deal with the hard edges associated with RGP lenses that may be uncomfortable. Instead, the comfort levels that patients experience are more like wearing fully soft lenses.

Multifocal Contact Lenses

Multifocal contact lenses are specialized lenses designed to correct presbyopia, a condition that typically occurs as you age, making it difficult to focus on near objects. Unlike traditional single-vision lenses that correct either near or distance vision, multifocal contact lenses incorporate multiple prescriptions into a single lens. This innovative design allows you to enjoy clear vision at various distances, eliminating the need for separate reading glasses or bifocals.

For more information about contact lenses, don’t hesitate to speak to our dedicated eye care team.