👁️ Contact Lens Guide

Contact lenses provide a convenient alternative to glasses for millions of people around the world. Modern contact lenses can correct nearsightedness, farsightedness, astigmatism, and presbyopia while offering excellent comfort, clear vision, and an active lifestyle. This guide explains the different types of contact lenses, leading brands, specialty lenses, proper lens care, and how contact lens prescriptions differ from eyeglass prescriptions.

Understanding Contact Lenses

Contact lenses are thin, curved optical devices that rest directly on the tear film covering the cornea. Unlike eyeglasses, contact lenses move with your eyes, providing a wider field of vision, minimal image distortion, and excellent peripheral vision.

👓 Alternative to Glasses

⚽ Great for Sports

🌎 Wider Field of Vision

👁️ Natural Appearance

🔬 Advanced Materials

💙 Comfortable Wear

Who Can Wear Contact Lenses?

Most healthy individuals are good candidates for contact lenses. During a comprehensive contact lens examination, your eye care professional evaluates your vision, corneal shape, tear film, ocular health, and lifestyle to determine which lenses are most appropriate.

👦

Children

Many children successfully wear contact lenses, especially for myopia control, sports, or high refractive errors when supervised by parents and their eye care professional.

🧑

Adults

Most adults with healthy eyes can comfortably wear soft, toric, multifocal, or specialty contact lenses depending on their visual needs.

👵

Older Adults

Many older adults continue wearing contact lenses successfully using multifocal lenses, monovision, or specialty lenses for presbyopia.

Benefits of Contact Lenses

🏃

Active Lifestyle

Excellent for sports, exercise, and outdoor activities.

👁️

Natural Vision

Provide a wide field of view with little peripheral distortion.

🌧️

No Fogging

Unlike glasses, contact lenses won’t fog during temperature changes.

😎

Cosmetic

Allow patients to enjoy natural vision without wearing glasses.

🎯

Stable Vision

Move with your eyes to provide consistent visual correction.

🕶️

Sunglasses

Wear any non-prescription sunglasses while maintaining clear vision.

Important: A contact lens prescription is not the same as an eyeglass prescription. Contact lenses require additional measurements including the base curve (BC), diameter (DIA), lens material, brand, and an evaluation of how the lens fits and moves on the eye. A professional contact lens fitting is necessary before wearing contact lenses.

🔍 Types of Contact Lenses

Modern contact lenses are available in many designs to meet different vision and eye health needs. Your eye care professional will recommend the most appropriate lens based on your prescription, corneal shape, tear quality, occupation, and lifestyle.

💧

Soft Contact Lenses

The most commonly prescribed lenses worldwide. Soft lenses provide excellent comfort, quick adaptation, and are available for nearsightedness, farsightedness, astigmatism, and multifocal correction.

🪨

Rigid Gas Permeable (RGP)

Rigid lenses provide exceptional optical quality and durability. They are commonly prescribed for irregular corneas, high astigmatism, and keratoconus.

🌊

Scleral Lenses

Large diameter lenses that vault over the cornea and rest on the sclera. They provide outstanding comfort for patients with keratoconus, severe dry eye, and irregular corneas.

🌙

Orthokeratology

Specially designed overnight lenses temporarily reshape the cornea while sleeping, allowing clear daytime vision without glasses or contact lenses.

📅 Contact Lens Replacement Schedule

Different contact lenses are designed to be replaced at different intervals. Following the recommended replacement schedule helps reduce deposits, improve comfort, and lower the risk of eye infections.

Replacement Type	Replace	Advantages	Best For
Daily Disposable	Every Day	Fresh sterile lens every day, lowest infection risk, no cleaning solution required	Most patients, allergies, dry eye, occasional wear
Biweekly	Every 2 Weeks	Excellent comfort with lower yearly cost	Frequent wearers
Monthly	Every Month	Wide prescription range and specialty designs	Regular full-time wearers
Quarterly	Every 3 Months	Available for selected specialty lenses	Some RGP and specialty fits
Annual RGP	1 Year or Longer	Excellent optics and durability	Keratoconus, irregular corneas, high astigmatism

🧬 Contact Lens Materials

The material used to manufacture a contact lens affects oxygen transmission, comfort, durability, and moisture retention.

Material	Advantages	Limitations
Hydrogel	Soft, comfortable, high water content	Lower oxygen transmission
Silicone Hydrogel	Excellent oxygen delivery, healthier corneas, longer comfortable wear	Slightly lower water content in some designs
Rigid Gas Permeable (RGP)	Sharp vision, durable, excellent oxygen permeability	Longer adaptation period
Scleral Materials	Excellent oxygen permeability with fluid reservoir	Professional fitting required

⭐ Who May Benefit from Specialty Contact Lenses?

👁️ Keratoconus

📐 High Astigmatism

👵 Presbyopia

🌙 Overnight Vision Correction

💧 Severe Dry Eye

🩺 Corneal Scarring

👦 Myopia Control

👁️ Irregular Corneas

🛡️ Contact Lens Safety

Practicing good contact lens hygiene significantly reduces the risk of eye infections and helps maintain healthy vision.

🧼 Wash Hands First

💧 Use Fresh Solution

🚫 Never Use Tap Water

🌙 Don’t Sleep in Lenses Unless Approved

🏊 Don’t Swim with Contacts

📅 Replace On Schedule

🧴 Clean Lens Case Frequently

👁️ Remove Lenses if Eyes Become Red or Painful

Important: If you develop eye pain, redness, light sensitivity, excessive tearing, blurred vision, or discharge while wearing contact lenses, remove your lenses immediately and seek prompt evaluation by an eye care professional. Contact lens–related infections can progress rapidly and may threaten vision if left untreated.

🌞 Daily Disposable Contact Lenses

Daily disposable lenses are replaced with a brand-new sterile lens every day. They offer excellent comfort, convenience, and the lowest risk of contact lens-related infections because no cleaning or storage is required.

Brand	Manufacturer	Material	Dk/t*	UV Protection	Best For
Acuvue Oasys 1-Day	Johnson & Johnson	Silicone Hydrogel	121	Yes	Dry eyes & long computer use
Acuvue Moist 1-Day	Johnson & Johnson	Hydrogel	33	Yes	First-time wearers
DAILIES TOTAL1	Alcon	Water Gradient Silicone Hydrogel	156	No	Severe dry eye
Precision1	Alcon	Silicone Hydrogel	100	No	Excellent comfort
MyDay	CooperVision	Silicone Hydrogel	100	Yes	Long daily wear
Clariti 1 Day	CooperVision	Silicone Hydrogel	86	Yes	Budget silicone hydrogel
Infuse	Bausch + Lomb	Silicone Hydrogel	134	No	Dry eye sufferers
Biotrue ONEday	Bausch + Lomb	HyperGel	42	No	Moisture retention
SofLens Daily Disposable	Bausch + Lomb	Hydrogel	24	No	Budget option

📅 Two-Week Replacement Contact Lenses

Biweekly lenses are worn daily and replaced every two weeks. They offer excellent comfort while remaining more economical than daily disposable lenses.

Brand	Manufacturer	Material	Dk/t	Best For
Acuvue Oasys	Johnson & Johnson	Silicone Hydrogel	147	Dry eyes
Acuvue Oasys for Astigmatism	Johnson & Johnson	Silicone Hydrogel	129	Astigmatism
Acuvue Oasys Multifocal	Johnson & Johnson	Silicone Hydrogel	147	Presbyopia

🗓️ Monthly Contact Lenses

Monthly contact lenses are designed for daily wear and require proper cleaning and storage each night unless specifically approved for overnight wear.

Brand	Manufacturer	Material	Dk/t	Best For
Biofinity	CooperVision	Comfilcon A	160	Long comfortable wear
Biofinity Energys	CooperVision	Comfilcon A	160	Digital device users
Clariti Monthly	CooperVision	Silicone Hydrogel	86	Affordable silicone hydrogel
Acuvue Vita	Johnson & Johnson	Silicone Hydrogel	147	Monthly replacement
Total30	Alcon	Water Gradient Silicone Hydrogel	154	Premium monthly lens
Air Optix Plus HydraGlyde	Alcon	Silicone Hydrogel	138	Comfort & moisture
Air Optix Night & Day Aqua	Alcon	Silicone Hydrogel	175	Extended wear*
Bausch + Lomb Ultra	Bausch + Lomb	Samfilcon A	163	Digital eye strain
PureVision2	Bausch + Lomb	Balafilcon A	130	High prescriptions
SofLens 59	Bausch + Lomb	Hydrogel	22	Economical monthly lens

🏭 Major Contact Lens Manufacturers

Johnson & Johnson Vision

Alcon

CooperVision

Bausch + Lomb

Menicon

Paragon Vision Sciences

Art Optical

Blanchard Contact Lenses

Dk/t (Oxygen Transmissibility): Higher Dk/t values generally allow more oxygen to reach the cornea, which may improve corneal health during lens wear. However, the most appropriate lens depends on many factors—including your prescription, tear film, corneal shape, wearing schedule, and ocular health—not just oxygen transmissibility.

Important: Extended or overnight wear should only be undertaken if the specific lens is approved for that use and your eye care professional has recommended it for you. Sleeping in contact lenses can increase the risk of serious eye infections.

📐 Toric Contact Lenses (Astigmatism)

Toric contact lenses are specifically designed to correct astigmatism. Unlike standard soft lenses, toric lenses contain different powers in different meridians and include stabilization features that help maintain the proper orientation on the eye.

Brand	Manufacturer	Replacement	Best For
Acuvue Oasys for Astigmatism	Johnson & Johnson	2 Weeks	Mild-to-high astigmatism
Acuvue Oasys 1-Day for Astigmatism	Johnson & Johnson	Daily	Daily disposable toric wear
Biofinity Toric	CooperVision	Monthly	Excellent rotational stability
MyDay Toric	CooperVision	Daily	Premium daily toric lens
DAILIES TOTAL1 Toric	Alcon	Daily	Dry eyes & astigmatism
Precision1 for Astigmatism	Alcon	Daily	Comfort & stability
Air Optix HydraGlyde for Astigmatism	Alcon	Monthly	Monthly toric wear
Bausch + Lomb Ultra for Astigmatism	Bausch + Lomb	Monthly	Digital device users

👓 Multifocal Contact Lenses

Multifocal contact lenses allow many patients with presbyopia to see clearly at distance, intermediate, and near without reading glasses.

Brand	Manufacturer	Replacement	Best For
Biofinity Multifocal	CooperVision	Monthly	Presbyopia
MyDay Multifocal	CooperVision	Daily	Daily disposable multifocal
DAILIES TOTAL1 Multifocal	Alcon	Daily	Dry eye & presbyopia
Total30 Multifocal	Alcon	Monthly	Monthly multifocal
Acuvue Oasys Multifocal	Johnson & Johnson	2 Weeks	Comfort & presbyopia
Ultra Multifocal	Bausch + Lomb	Monthly	Near & intermediate vision

👦 Myopia Control Contact Lenses

Myopia control lenses are designed to slow the progression of nearsightedness in children. These lenses should only be prescribed and monitored by an eye care professional experienced in myopia management.

Lens	Manufacturer	Type	Typical Use
MiSight® 1 Day	CooperVision	Daily Soft Lens	FDA-approved myopia management
NaturalVue® Multifocal	Visioneering Technologies	Daily Soft Lens	Myopia management
Paragon CRT®	Paragon Vision Sciences	Orthokeratology	Overnight corneal reshaping
Euclid Emerald®	Euclid Systems	Orthokeratology	Myopia control
MoonLens®	Various Laboratories	Orthokeratology	Custom overnight lenses

🌊 Specialty Lenses for Keratoconus

Patients with keratoconus or highly irregular corneas often achieve significantly better vision with specialty lenses than with traditional soft contact lenses.

Lens	Type	Best For
Rose K®	RGP	Mild-to-moderate keratoconus
Zenlens®	Scleral	Advanced keratoconus
Boston PROSE®	Scleral	Severe ocular surface disease
Europa Scleral	Scleral	Irregular corneas
SynergEyes®	Hybrid Lens	RGP optics with soft comfort
Boston EO®	Rigid Gas Permeable	Irregular corneas

🎨 Colored Contact Lenses

Colored contact lenses may be prescribed with or without vision correction. Even cosmetic contact lenses require a valid prescription and proper fitting to reduce the risk of eye injury and infection.

Brand	Manufacturer	Purpose
Air Optix Colors®	Alcon	Cosmetic enhancement
FreshLook ColorBlends®	Alcon	Natural color enhancement
Acuvue Define®	Johnson & Johnson	Enhances iris appearance
Solotica®	Solotica	Cosmetic color change
FreshKon Colors®	FreshKon	Cosmetic lenses

Important: Decorative or cosmetic contact lenses are medical devices. Purchasing lenses without a prescription or sharing lenses with another person may increase the risk of serious eye infections, corneal ulcers, and permanent vision loss.

👓 Approximate Glasses to Contact Lens Conversion

As prescriptions become stronger, the contact lens power often differs slightly from the eyeglass prescription because contact lenses sit directly on the eye rather than approximately 12 mm in front of it. This adjustment is known as vertex distance compensation.

Glasses Prescription	Approximate Contact Lens Power
Plano to -4.00	Usually the same
-4.25	-4.00
-4.50	-4.25
-4.75	-4.50
-5.00	-4.75
-5.50	-5.25
-6.00	-5.75
-6.50	-6.00
-7.00	-6.50
-7.50	-7.00
-8.00	-7.50
-9.00	-8.50
-10.00	-9.50
-11.00	-10.25
-12.00	-11.00

Glasses Prescription	Approximate Contact Lens Power
Plano to +4.00	Usually the same
+4.25	+4.50
+4.50	+4.75
+5.00	+5.50
+6.00	+6.50
+7.00	+8.00
+8.00	+9.00
+9.00	+10.25
+10.00	+11.50

Important: These values are approximate spherical conversions only and are intended for educational purposes. A contact lens prescription also requires a professional fitting, corneal measurements, base curve, diameter, lens movement assessment, and evaluation of ocular health.

🧴 Contact Lens Care Solutions

Proper cleaning and storage help maintain healthy eyes and reduce the risk of contact lens-related infections.

Solution	Type	Common Uses
Biotrue®	Multipurpose	Cleaning, disinfecting, storing soft lenses
Opti-Free PureMoist®	Multipurpose	Daily cleaning & storage
Opti-Free Replenish®	Multipurpose	Improved moisture retention
Renu Fresh®	Multipurpose	Cleaning & disinfecting
Complete RevitaLens®	Multipurpose	Daily lens care
Clear Care Plus®	Hydrogen Peroxide	Deep cleaning & disinfection
Purilens Plus®	Sterile Saline	Rinsing scleral & RGP lenses
Boston Cleaner®	RGP Cleaner	Cleaning rigid gas permeable lenses
Boston Conditioning Solution®	RGP Conditioner	Conditioning & storage

Never use tap water, bottled water, or saliva to clean contact lenses. These can introduce bacteria, fungi, or amoebae that may cause serious sight-threatening eye infections.

❓ Frequently Asked Questions

Can I sleep in my contact lenses?

Only lenses specifically approved for overnight wear should be worn while sleeping, and only if recommended by your eye care professional. Sleeping in contact lenses significantly increases the risk of eye infections.

Can I shower or swim while wearing contact lenses?

It is generally recommended to avoid showering, swimming, or using hot tubs while wearing contact lenses because water can introduce harmful microorganisms that may lead to serious eye infections.

Can a contact lens get stuck behind my eye?

No. A thin membrane called the conjunctiva covers the white part of the eye and prevents a contact lens from moving behind the eyeball.

Can I order contacts using my glasses prescription?

No. A glasses prescription is not a contact lens prescription. Contact lenses require additional measurements including the base curve (BC), diameter (DIA), brand, and a professional fitting.

What should I do if my contact lens feels uncomfortable?

Remove the lens immediately. Inspect it for damage or debris. If discomfort, redness, blurred vision, or pain persists after removing the lens, seek prompt evaluation by an eye care professional.

How often should I replace my contact lens case?

Most eye care professionals recommend replacing your contact lens case approximately every three months or sooner if it becomes damaged or visibly contaminated.

Are colored contact lenses safe?

Yes, when properly prescribed and fitted by an eye care professional. Decorative lenses purchased without a prescription can increase the risk of infection and vision-threatening complications.

When should I stop wearing my contact lenses?

Remove your contact lenses immediately if you experience eye pain, redness, light sensitivity, excessive tearing, discharge, or blurred vision, and arrange an urgent eye examination.

Medical Disclaimer

The information provided by Kardia Eye Resource Center is intended for educational purposes only and should not replace professional medical advice, diagnosis, or treatment.

Every contact lens prescription is individualized and includes much more than lens power. Proper contact lens fitting requires measurements of the cornea, assessment of tear film quality, evaluation of lens movement, and monitoring of eye health by an eye care professional.

If you experience persistent discomfort, eye redness, severe pain, light sensitivity, sudden vision changes, or discharge while wearing contact lenses, discontinue lens wear immediately and seek prompt evaluation by an eye care professional.

📄 Understanding Your Contact Lens Prescription

A contact lens prescription contains several measurements that are different from an eyeglass prescription. These measurements help ensure that your lenses fit comfortably, provide clear vision, and maintain healthy eyes.

Abbreviation	Meaning	Description
SPH	Sphere	Corrects nearsightedness (-) or farsightedness (+).
CYL	Cylinder	Amount of astigmatism correction.
AXIS	Axis	Orientation of astigmatism (1–180°).
BC	Base Curve	The curvature of the back surface of the contact lens.
DIA	Diameter	The width of the contact lens in millimeters.
ADD	Near Addition	Additional power used in multifocal lenses.
Brand	Lens Design	The exact contact lens approved for your eyes.
Replacement	Schedule	Daily, biweekly, monthly, or another replacement interval.

👁️ How to Insert Contact Lenses

🧼 Wash Your Hands

👁️ Inspect the Lens

👌 Place on Fingertip

👆 Hold Eyelids Open

🎯 Look Straight Ahead

💧 Place Lens Gently

😉 Blink Slowly

✅ Confirm Comfort

Tip: Before inserting a soft contact lens, make sure it is not inside out. A properly oriented lens should resemble a smooth bowl with the edges pointing straight upward.

🙌 How to Remove Contact Lenses

🧼 Wash Hands

👀 Look Up

👇 Slide Lens Down

🤏 Pinch Gently

🧴 Clean or Dispose

📦 Store Correctly

Never use your fingernails to remove a contact lens, as this may damage the lens or scratch the surface of the eye.

⚠️ Common Contact Lens Problems

Problem	Possible Cause	Recommended Action
Blurred Vision	Dirty lens, incorrect prescription, dry eye	Remove and clean the lens. If symptoms persist, schedule an eye examination.
Dryness	Reduced tear production or prolonged screen time	Use contact lens-compatible lubricating drops and take regular blinking breaks.
Red Eye	Lens overwear, irritation, infection	Remove the lenses immediately and seek evaluation if redness persists.
Pain	Corneal abrasion, infection, foreign body	Stop wearing lenses and seek urgent eye care.
Lens Tears Frequently	Age of lens, improper handling	Replace the lens and review handling techniques.
Lens Keeps Falling Out	Incorrect fit or inside-out lens	Schedule a contact lens fitting evaluation.

🚨 Potential Contact Lens Complications

🔴 Corneal Ulcer

🦠 Microbial Keratitis

💧 Dry Eye Disease

🌡️ CLARE

👁️ GPC

🩸 Corneal Neovascularization

⚪ Corneal Infiltrates

😣 Contact Lens Intolerance

Seek urgent eye care immediately if you develop severe eye pain, light sensitivity, rapidly worsening redness, decreased vision, or significant discharge while wearing contact lenses. These symptoms may indicate a serious eye infection requiring prompt treatment.