Blurry Vision: Causes and Solutions for Contact Lens Users

Blurred vision

Hello Doctor: I recently got new glasses and soft contact lenses, with vision of 7-8 diopters and astigmatism of L:150 and R:200.
Based on past experiences, contact lenses never seem to fit perfectly on the first try, and I have already changed them three times this time.
I often feel that my vision fluctuates between clear and blurry, especially in my right eye.
When I test each eye separately, my left eye is more stable, but my right eye starts to become blurry after about three seconds.
I wonder if the contact lenses are not suitable and are shifting.
I visited an ophthalmologist, who said everything looks fine, with an angle of 170, and suggested that my eyes might be too dry.
Blinking or using artificial tears does help to clear my vision, but I can't keep blinking or applying artificial tears all the time.
Today, I noticed that wearing glasses also causes similar issues; my left eye is less affected, but my right eye can also become blurry (when tested separately) and feels slightly sore at times.
Sometimes both eyes are fine.
Does this mean it’s not an issue with the contact lenses, but rather a problem with my eyes? Are these test results considered normal? I really don’t know what to do.
Since I just got new lenses, I would need to change them again soon, but I’m unsure where the problem lies.
I hope you can respond quickly, thank you! P.S.: The optician mentioned that I might have an uneven cornea, which could cause the contact lenses to shift, but why does my vision also become blurry with glasses? Additionally, would wearing contact lenses of different colors in each eye (to avoid confusion, although the optician disagreed) harm my eyes? Thank you again for your response.

JOJO, 30~39 year old female. Ask Date: 2006/07/24

Dr. Liu Jingxian reply Ophthalmology

Dear Friend,
Hello.
Since Dr.
Liu Jing-Hsien is currently abroad, Dr.
Chang Tsung-Chi will be responding in his place.
Based on your description, we will consider insufficient tear production as the primary suspect.
Insufficient tear production is also known as dry eye syndrome.
First, we recommend that you visit a hospital for some tests, such as the tear secretion test and tear break-up time assessment.
If the results indicate dry eye syndrome, we will then investigate the underlying causes.
First, let's understand that tears consist of three layers: the mucin layer, the aqueous layer, and the lipid layer, which are secreted by different tissues and serve distinct functions.
If any one of these layers is deficient, it can lead to dry eye syndrome.
The causes of deficiency in each layer can vary.
For instance, vitamin A deficiency and conjunctival scarring from trachoma can lead to insufficient mucin layer production.
A deficiency in the aqueous layer can be caused by congenital tear deficiency or acquired autoimmune diseases.
Additionally, the secretion of the lipid layer may be affected by eyelid scarring or blepharitis.
Once we identify the cause, we can tailor the treatment accordingly.
For example, vitamin A supplementation or autologous conjunctival grafts can be used to address issues with the mucin layer.
The aqueous layer can be stimulated through warm compresses and massages, or by using artificial tears, as well as employing methods to reduce tear evaporation or drainage, such as increasing indoor humidity, using windshields while biking, or performing punctal occlusion.
For issues with the lipid layer, warm compresses can enhance secretion, and antibiotics may be used to treat blepharitis.
Additionally, we should consider lifestyle modifications and eye care habits, such as ensuring adequate sleep, maintaining a balanced diet, and taking breaks every fifty minutes during reading or computer use to rest your eyes for ten minutes.
These simple steps can help improve or even prevent dry eye syndrome.
This is just a very brief overview.
It is best for you to visit an ophthalmologist for a detailed examination and assessment to determine your specific condition, how to improve it, and what type of contact lenses may be suitable for you.

Wishing you good health,
Dr.
Chang Tsung-Chi
Ophthalmology
Taipei City Hospital, Zhongxing Branch

Reply Date: 2006/07/24

More Info

Understanding blurry vision, especially for contact lens users, can be quite complex due to various factors that can affect visual clarity. Based on your description, it seems you are experiencing fluctuating vision clarity, particularly in your right eye, which can be frustrating. Let’s break down the potential causes and solutions for your situation.

Potential Causes of Blurry Vision
1. Contact Lens Fit and Type: The fit of your contact lenses is crucial. If the lenses are not fitting properly, they can move on the eye, leading to inconsistent vision. You mentioned that your optometrist suggested that your cornea might be uneven, which could cause the lenses to shift. This shifting can lead to blurry vision as the lens may not sit correctly over the cornea, affecting the light entering your eye.

2. Dry Eyes: Dryness is a common issue for contact lens wearers. You noted that blinking or using artificial tears helps clear up your vision temporarily. This indicates that your eyes may not be producing enough tears to keep the lenses moist, leading to dryness and discomfort. Dry eyes can cause blurry vision, especially when wearing contact lenses, as they rely on a film of tears to maintain clarity.

3. Lens Quality and Prescription: Sometimes, the quality of the lenses or an incorrect prescription can lead to visual disturbances. If your prescription has changed or if the lenses are not made to your specific requirements, this could result in fluctuating clarity. It’s essential to ensure that your lenses are the correct type for your specific vision needs, including any astigmatism.

4. Eye Fatigue: Prolonged screen time or focusing on close objects can lead to eye strain, which may cause temporary blurriness. This is often exacerbated by dry eyes or improper lens fit.
5. Underlying Eye Conditions: While your eye exam showed no significant issues, conditions like astigmatism or changes in the cornea can lead to visual disturbances. If your right eye is consistently worse than your left, it may be worth investigating further.

Solutions and Recommendations
1. Consult Your Eye Care Professional: Since you’ve already seen an eye doctor, it may be beneficial to return for a follow-up, especially if your symptoms persist. They might consider a different type of lens or further investigate the fit and curvature of your lenses.

2. Hydration and Artificial Tears: Continue using artificial tears to keep your eyes moist. Consider using preservative-free artificial tears, as they can be used more frequently without irritation. Staying hydrated by drinking plenty of water can also help maintain tear production.

3. Lens Care: Ensure that you are following proper lens care and hygiene practices. This includes cleaning and storing your lenses correctly and replacing them as recommended.

4. Adjust Your Environment: If you spend a lot of time on screens, take regular breaks using the 20-20-20 rule: every 20 minutes, look at something 20 feet away for at least 20 seconds. This can help reduce eye strain.

5. Consider Different Lens Types: If your current lenses continue to cause issues, discuss with your optometrist the possibility of trying different types of lenses, such as daily disposables or lenses specifically designed for dry eyes.

6. Monitor Symptoms: Keep a diary of when your vision is clear versus when it becomes blurry. Note any activities or environmental factors that may correlate with these changes. This information can be valuable for your eye care provider.

Color Differentiation in Lenses
Regarding your question about wearing different colored lenses, while it is generally safe to wear different colored lenses in each eye, it is essential to ensure that both lenses are of the correct prescription and fit. Mixing colors should not inherently harm your eyes, but it is crucial to prioritize proper vision correction and comfort.

In conclusion, while your symptoms may be related to lens fit and dryness, it’s essential to continue working with your eye care professional to find the best solution for your specific needs. Regular follow-ups and open communication about your symptoms will help ensure that you achieve the best possible vision and comfort with your contact lenses.

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