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Doctor insights on: What Does Power Mean In Contact Lenses

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How do I stop cloudy film from forming inside my contac lens? I have been wearing gas permeable contact lenses without any significant problems. In the last 6 months, everytime I put my contact lenses on- the right lens gets cloudy and it has a film over

How do I stop cloudy film from forming inside my contac lens? I have been wearing gas permeable contact lenses without any significant problems. In the last 6 months, everytime I put my contact lenses on- the right lens gets cloudy and it has a film over

This: This could be a fit issue where debris is being trapped. It could also be the gpc as previously mentioned. I also see similar issues with severe lid inflammation and contact lens use - make sure you are cleaning your eyelids very well each day. I also feel patients that use make-up around the eyes need to be careful with contact lens use. It is amazing the amount of make-up that makes its way into the tear film. ...Read more

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What does the power on contact lenses mean?

What does the power on contact lenses mean?

The power is: The strength of the contact lens. It is part of the parameters that defines a contact lens. ...Read more

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What exactly does contact lens diameter mean?

What exactly does contact lens diameter mean?

The diameter!: It is the diameter of the circular contact lens. The size, has nothing to do with the power of the lens. ...Read more

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What is the best operation to correct sight? I am 26 years old, contact lens -9.0 power right and left.

Myopic correction: There is not a single good proven procedure to correct high myopia like yours. Many factors need to be evaluated in decision making and some of those being thickness of your corneas, any ongoing refractive error changes over the last 6 months and your expecatations from the operation.
You may be candidate for a refractive surgery based on ophthalmological examination and diagnostic tests. ...Read more

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Contact lens power -3.75 is this bad?

Moderate: This is a low to moderate near sighted rx. Nothing to be concerned about. ...Read more

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What does it mean if my contact lens move when I blink?

What does it mean if my contact lens move when I blink?

Normal: Contact lenses are supposed to move when you blink. Excessive movement causes blurred vision and discomfort. ...Read more

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Can you tell me how could I find out the contact lens strength/power I need?

Contact lens fitting: The proper strength and other parameters can be determined through the process called a contact lens fitting. Your eye doctor can likely provide this service for you. ...Read more

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Can I use old contact lens? I mean ones that have past their expiration date?

Expired contacts: Do not use contact lenses that have expired. They sit in a solution that has a shelf life. Doing so puts you at risk for problems including infection that can lead to severe vision loss (blindness) or even loss of eye. ...Read more

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What's my prescription for contact lens power?

The convention: Is that the top line is for the right eye and the second line is for the left eye. ...Read more

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What does it mean if my astigmatism is too high for regular contact lenses?

Toric lenses: If you have more than 1.00 diopter of astigmatism, you probably won't see sharply in standard spherical soft contact lenses. However you can be fit for either toric soft contacts or rigid gas permeable (rgp) lenses and achieve excellent vision. ...Read more

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Is there a way to convert contact lens power to a simple central visual acuity?

No: The relationship between lens power and the standard vision fraction like 20/20 is not linear. These two items do not interconvert. ...Read more

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If my two contact lenses have the power of -2.25 and -3.50, what would that be in terms of 20/20?

Don't work that way: Sorry, it doesnt' work that way. Presumably those powers were prescribed to attain best vision. If your best corrected vision is 20/20, then it would be 20/20. If your best corrected vision is 20/200, then that's what it would be. ...Read more

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I have -5.5 spherical and -.5 cylindrical power with axis 10, what should be my contact lens power?

I have -5.5 spherical and -.5 cylindrical power with axis 10, what should be my contact lens power?

Contact lens fitting: You really need to be properly fitted for contacts. For contacts, you not only need the power, but you also need the diameter of the contact lens and a base curve. Both these two numbers describe the shape of the contact lens and you need to be evaluated to see which lens provides the best fit for your eyes. A poorly fitted contact lens may increase the risk for eye infections. ...Read more

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My contact lens diameter is 14.5. Does it matter if I buy new contact lenses with a diameter of 14 if everything is the same (power, bc, etc)?

My contact lens diameter is 14.5. Does it matter if I buy new contact lenses with a diameter of 14 if everything is the same (power, bc, etc)?

Probably not: It should not make a big difference but the diameter of a lens can change the fit. In general, you should stick to the lenses prescribed by your eye doctor. If you want to change lenses for whatever reason, it is best to see your doctor and get a new prescription to make sure that it is safe for you. ...Read more

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I use cylindrical glasses with -1.25 power. Will it remain same for my contact lenses?

At this power: Yes the contact lenses would be the same. But you need to have them fit with the appropriate base curve, this requires an eye care doctor to determine the fit. ...Read more

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My contact lens Rx is -3.75 BC 8.8 DIA 14.0 (left) & -3.50 BC 8.8 DIA (right). What does that mean in terms of myopia severity & Rx strength? Curious.

My contact lens Rx is -3.75 BC 8.8 DIA 14.0 (left) & -3.50 BC 8.8 DIA (right). What does that mean in terms of myopia severity & Rx strength? Curious.

Myopia: Your degree of nearsightedness is mild-moderate level. Your contact lens prescription indicates this -3.50 OD (right), -3.75 OS (left). The BC is the base curve of contact which is the curvature measurement in milimeters of the back of the contact (smaller the number the more curved or steeper your cornea). The diameter is how wide the contact is and how it will rest on your eye. ...Read more

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What are the long term effects of sleeping in 30 day contact lenses that aren't meant to be slept in?

What are the long term effects of sleeping in 30 day contact lenses that aren't meant to be slept in?

Bad idea: Never sleep in your contact whether they say you can or not. Sleeping in contacts can lead to serious cornea infections. ...Read more

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How to find out my contact lens eye power?

How to find out my contact lens eye power?

By examinarion: An eye exam, including a refraction, is the process by which a prescription for vision correction is rendered. A contact lens power is calculated from the refraction and vertex distance. An eye care professional is qualified to perform these measurements. ...Read more

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What can I do when I can't remove my contact lenses, I mean when I feel they're stuck to my eyes ; and my eyes become irritated because of trying?

Lubrication: Try hydrating the contact lenses with re-wetting drops before attempting to remove them. If this is an ongoing problem, you probably need to be refit in a different contact lens material that is better for dry eyes. A poor contact lens fit puts you at risk for a corneal infection. ...Read more

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Recently I got eyeglass prescription were I got power -2.75 in both eyes. Should I also use contact lenses with power -2, 75 in both eyes?

Recently I got eyeglass prescription were I got power -2.75 in both eyes. Should I also use contact lenses with power -2, 75 in both eyes?

Probably: There is not always a direct correspondence between eyeglass power and contact lenses but with a simply myopia that you have, you can feel safe ordering the same power in contacts. Be sure to follow the rules of wearing contact lenses to avoid trouble. ...Read more

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What does it mean when the patient monograph for ortho tri cyclen (ethinyl estradiol and norgestimate) lo says it may make it difficult to wear contact lenses?

Tear flow: In susceptible individuals, ortho tri cyclen (ethinyl estradiol and norgestimate) lo can alter the tear flow, usually lowering it, which can make contact lens wear more difficult. This is not common and tears can be supplemented so this is not a major issue. ...Read more

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I had a corneal ulcer 4 months back & have a corneal scar now. I hv -4.5 power both eyes. Can I wear my silicon hydrogel contact lens on few occasions?

Beware: Before you try to wear your contacts again, please see your eye doctor for a corneal evaluation. The corneal scar likely has changed the shape of the eye and you may require a new fitting. Wearing the wrong size contact lens may cause worse scarring or even infections! ...Read more

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How to clean my contact lens?

Easy: Place the contact in the palm of your hand. Cover it with contact lens solution. Rub with your finger for 15 seconds. Flip it over and repeat. Place it in your contact lens case with new solution. ...Read more

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How effective are this contact lens?

For what?: Contact lenses are often used to help people see better. They are also used as a bandage over the eye to promote comfort and healing. They usually work well in both instances. To give you more information, we would need to know more details. ...Read more

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Why do my contact lens keep ripping?

Contact lenses: There are several possible reasons why your contacts often tear. The first may be how you're handling them when you remove them. Also, if your eyes tend to be dry, it may help to instill a rewetting drop in your eyes before removing the lenses. In addition, there are certain brands of contacts which tend to tear more easily. Try a different brand of lenses. Talk to your eye doctor about this. ...Read more

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Are contact lens better than spects?

Sometimes: Spectacles can usually provide very precise improvement of vision. But some circumstances will improve better with contacts. These include the condition keratoconus, and also diseases of the corneal surface as well as very high degrees of refractive power needs. Contacts of course have their convenience and cosmetic effects although glasses in the right hands can be a fashion statement. ...Read more