The term “0.00 power contact lenses” refers to non-corrective lenses that do not contain any vision-altering prescription. The power of a contact lens, measured in diopters, indicates the strength needed to correct nearsightedness or farsightedness, with zero representing a neutral power for an eye that does not require vision correction. These lenses, often called “plano” lenses, are sought after by individuals who want to change the appearance of their eyes without affecting their vision. Their use is primarily related to cosmetic purposes, such as enhancing or completely changing the natural eye color or creating dramatic effects for costumes and theatrical events.
Defining Plano Lenses and Their Purpose
Plano contact lenses have a refractive power of 0.00 diopters, meaning they do not converge or diverge light to correct a visual error. Even without a corrective power, these devices are manufactured with specific measurements that are essential for eye health and comfort. The lens material must allow sufficient oxygen to pass through to the cornea, and the base curve and diameter must precisely match the wearer’s eye shape. If the curvature is too flat or too steep, it can cause discomfort, restricted oxygen flow, or mechanical damage to the eye’s surface.
The primary application for plano lenses is cosmetic alteration, with options ranging from color-enhancing tints to opaque color changes. Color-enhancing lenses use translucent tints to make a light eye color more vibrant, while opaque lenses completely cover the natural iris color with a new hue or pattern. Novelty or decorative lenses fall into the opaque category, featuring theatrical designs like cat eyes or vampire eyes for costumes. These decorative lenses are still subject to the same regulatory standards as vision-correcting lenses due to their direct contact with the eye.
Why You Need a Prescription for Plano Lenses
All contact lenses, including those with 0.00 power, are classified as medical devices and require a valid prescription for purchase in the United States. This classification exists because the lens sits directly on the sensitive surface of the eye, and an improper fit can lead to severe complications. The prescription is a medical document specifying the required measurements for the lens, including the base curve and diameter, to ensure a safe and proper fit on the cornea. An eye care professional conducts an examination to measure the eye’s unique contours and assess its response to contact lens wear, which maintains corneal health.
Purchasing lenses without a prescription, often from unauthorized vendors like novelty shops or online marketplaces, is illegal and dangerous. These illegally sold lenses are frequently counterfeit or poorly manufactured, lacking the precise dimensions or quality control of regulated products. Ill-fitting lenses can scratch the cornea, leading to painful corneal abrasions, which are open pathways for bacteria to enter the eye. This can result in sight-threatening conditions like microbial keratitis, a severe eye infection that has led to permanent vision loss or the need for a corneal transplant.
Essential Safety and Hygiene Practices
Once a proper prescription is obtained, strict hygiene practices are necessary to prevent eye infections and maintain eye health.
- Always wash hands thoroughly with soap and water and dry them with a lint-free towel before handling lenses.
- Clean and store lenses using only fresh, doctor-recommended disinfecting solution.
- Never use tap water or saliva, as they introduce harmful microorganisms to the eye.
- Adhere strictly to the prescribed replacement schedule (daily, biweekly, or monthly).
- Replace the contact lens case with a new one every three months to prevent bacterial buildup.
- Never sleep in lenses unless they are specifically approved for overnight wear by an eye care professional.
- Avoid sharing contact lenses, even briefly, as this transmits germs and can cause conditions like pink eye.
Following these steps is the most effective way to safely enjoy plano lenses while minimizing the risk of complications.