Treat Myopia Early

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Myopia is a vision condition that increases your risk for other eye diseases like retinal tears, glaucoma and cataracts. 90% of myopia starts developing in early childhood. Take action to protect your child’s eyes – make an appointment today. #nearsightedness

For more information, contact Dr. Edward Fong and the Sugar Land eye doctors and optometrists at Bright Eye Care & Vision Development.

References available upon request.

Medical Disclaimer. The information on this site is not intended or implied to be a substitute for professional medical advice, diagnosis or treatment. All content, including text, graphics, images and information, contained on or available through this website is for general information purposes only.

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Women and Eye Disease

Women are more prone to eye disease. 67% of blindness and visual impairment occur in women according to a study by the University of Chicago. This higher prevalence of eye disease, per the National Institute of Health, is likely due to:

• women living longer than men
• women being at higher risk for autoimmune disorders
• women being more likely to undergo certain cancer treatments that affect the eyes
• normal age-related hormonal changes that affect the eyes

Regular eye exams, not just routine eye exams, that evaluate for specific eye diseases become increasingly important for women as they age.

For more information, please contact Dr. Edward Fong and the Sugar Land, TX eye doctors and optometrists at Bright Eye Care & Vision Development.

References available upon request.

Medical Disclaimer. The information on this site is not intended or implied to be a substitute for professional medical advice, diagnosis or treatment. All content, including text, graphics, images and information, contained on or available through this website is for general information purposes only.

Amblyopia or Lazy Eye

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Clinical studies indicate that children with amblyopia suffer from the following:

• Slower reading speed
• Worse fine motor skills
• Lower self-perception

Amblyopia is a condition in which the eyes are physically healthy, but because of an amblyogenic factor – high prescription, unequal prescription, form deprivation or strabismus – the eye never develops 20/20 eyesight. Consequently, amblyopia may hamper a child’s ability to showcase their knowledge, compete in physical activities and/or interact well socially.

If a child sees significantly better in one eye than another, then that child may be at risk for amblyopia. Active therapy is the best route to help the child develop use of both eyes in order to see comfortably and accurately. Patching will not accomplish that goal. We specialize in pediatric vision including amblyopia.

For more information, please contact Dr. Edward Fong and the Sugar Land, TX eye doctors and optometrists at Bright Eye Care & Vision Development.

References available upon request.

Medical Disclaimer. The information on this site is not intended or implied to be a substitute for professional medical advice, diagnosis or treatment. All content, including text, graphics, images and information, contained on or available through this website is for general information purposes only.

Diet Soda and Diabetes

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A recently published study indicates that DIET SODA DOUBLES the RISK for diabetic retinopathy in patients with diabetes. Diabetic retinopathy is an eye disease that is a leading cause of blindness.

For more information, please contact Dr. Edward Fong and the Sugar Land, TX eye doctors and optometrists at Bright Eye Care & Vision Development.

References available upon request.

Medical Disclaimer. The information on this site is not intended or implied to be a substitute for professional medical advice, diagnosis or treatment. All content, including text, graphics, images and information, contained on or available through this website is for general information purposes only.

Hyperopes vs. Myopes

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For your enjoyment, here are some interesting differences between hyperopes (“farsighted” people) and myopes (“nearsighted” people):

1) In a study involving male students, hyperopes were more likely to be interested in business skills and selling.
2) In another study involving military recruits, hyperopes weighed more and had a lower heart rate variability. A low heart rate has been associated with a poorer ability to adapt to stress.
3) In another study involving college students, hyperopes were found to be more extroverted.
4) Hyperopes have prescriptions that start with a (+) sign whereas myopes have prescriptions that start with a (-) sign.
5) Hyperopes have eyeglass lenses that are thicker in the center whereas myopes have eyeglass lenses that are thicker at the edges.
6) Hyperopes’ eyeglasses make their eyes look bigger whereas myopes’ eyeglasses make their eyes look smaller.
7) Hyperopes have contact lenses that are thicker in the middle, so their lenses are harder to handle and transmit less oxygen.
8) Laser vision correction is less stable for hyperopes.

For more information, please contact Dr. Edward Fong and the Sugar Land, TX eye doctors and optometrists at Bright Eye Care & Vision Development.

References available upon request.

Medical Disclaimer. The information on this site is not intended or implied to be a substitute for professional medical advice, diagnosis or treatment. All content, including text, graphics, images and information, contained on or available through this website is for general information purposes only.

Dyslexia and Vision

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In a clinical study comparing the visual skills in students with developmental dyslexia versus those in normal readers, the authors concluded that “deficits in visual function [were] far more prevalent in school-aged children with developmental dyslexia than in typically developing readers”. Nearly 80% of children with developmental dyslexia suffered from visual skills dysfunction.

If your child is struggling with reading, it is imperative that you have his/her visual skills thoroughly evaluated. A yearly eye exam will not investigate these areas of the visual system. We specialize in visual skills that affect reading, writing and learning.

For more information, please contact Dr. Edward Fong and the Sugar Land, TX eye doctors and optometrists at Bright Eye Care & Vision Development.

References available upon request.

Medical Disclaimer. The information on this site is not intended or implied to be a substitute for professional medical advice, diagnosis or treatment. All content, including text, graphics, images and information, contained on or available through this website is for general information purposes only.

Eye Injuries – Help is On the Way

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Eye trauma is a common cause of vision loss in children. One of the results of the injury is often poor eyesight due to a misshapen cornea. Standard glasses and contact lenses will not be able to correct this because of the irregular shape caused by the damage. However, specialty contact lens designs can help these patients see better and look better afterwards.

For more information, please contact Dr. Edward Fong and the Sugar Land, TX eye doctors and optometrists at Bright Eye Care & Vision Development.

References available upon request.

Medical Disclaimer. The information on this site is not intended or implied to be a substitute for professional medical advice, diagnosis or treatment. All content, including text, graphics, images and information, contained on or available through this website is for general information purposes only.

Smartphones

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Smartphones emit the highest amount of harmful blue light in a comparison of digital devices. The red curve in the graph represents smartphones. Blue light has been associated with increased risk for eye disorders and sleep disorders.

According to the 2016 Nielsen Company Audience Report, adults spend more than 10 hours per day using smartphones, tablets, personal computers, video games, DVDs, DVRs and/or TVs. Teens spend almost 9 hours per day consuming digital media according to the 2015 Common Sense Media Census. Tweens, between the ages of 8 and 12 years, spend approximately 6 hours every day interacting with digital media. Even children under the age of 8 years spend approximately 2 hours in front of a screen according to the same census.

Needless to say, blue light is a common environmental hazard that would benefit from proactive precautionary protection.

For more information, please contact Dr. Edward Fong and the Sugar Land, TX eye doctors and optometrists at Bright Eye Care & Vision Development.

References available upon request.

Medical Disclaimer. The information on this site is not intended or implied to be a substitute for professional medical advice, diagnosis or treatment. All content, including text, graphics, images and information, contained on or available through this website is for general information purposes only.

Why does my vision change?

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Have you ever wondered why your vision changes from year-to-year or month-to-month or even day-to-day? The term “vision” includes a wide spectrum of visual skills, and for this article, we will concentrate on two inter-related aspects – eyesight and prescription. The references for this information are listed at the end of the article for your review.

According to research studies and clinical observation, the following can cause temporary or longer-lasting changes in a person’s visual acuity and/or prescription. Not everyone who experiences one or more of the following will experience a vision change, but vision changes have been observed in enough of these situations to be aware of its potential effects:

  1. Diurnal changes in corneal curvature
  2. Menstrual cycle
  3. Stress hormones
  4. Diabetes
  5. Cataracts
  6. Medications
  7. Dry Eyes
  8. Pregnancy
  9. Increasing axial length
  10. Muscle spasms

The curve of the cornea changes during the day. Clinical studies show that a person’s cornea can change as much 0.83 diopters. This would effectively mean that how you see out of the same pair of glasses could go from 20/20 to approximately 20/40 just from normal daily changes in your corneal shape. To help you better understand how this works, think about LASIK. This refractive surgery procedure changes your prescription by permanently altering the shape of your cornea through lasers. If you flatten the cornea, then you would change the prescription a certain way. Alternatively, if you steepen the cornea, you would change the prescription another way. Similarly, normal changes in corneal shape during the day can alter your prescription and how you see.

Changes in the cornea have also been observed during the menstrual cycle. Clinical studies reveal that the curvature of the cornea steepens in the early phase while flattening during ovulation. The thickness of the cornea changes too during the menstrual cycle. The cornea thickens at ovulation and then thins out afterwards. Changes in curvature, as discussed earlier, and changes in thickness will affect your prescription and acuity. This is why some people may notice variations in acuity and prescription on a monthly basis even though they are wearing the same prescription.

Stress can affect many aspects of a person’s health including his/her vision. In response to stress, your body releases many different hormones including cortisols, catecholamines, vasopressin, gonadotropins and potentially more. A number of these hormones will affect the function and physiology of your eyes and visual system. That discussion would be too detailed for this forum, but this is what it effectively means: If you’ve been stressed out all day and then visit the doctor, your prescription may be different once your stress has subsided and vice versa.

Changes in blood sugar levels can cause changes in vision and prescription. Sugar can be trapped in the crystalline lens of the eye thereby causing it to swell. This swelling will change a person’s prescription. Alternatively, when a person’s sugar levels decrease, the crystalline lens will release the trapped sugars. The prescription again will change because the shape of the crystalline lens has changed. So, if you have diabetes, you can expect to occasionally experience changes in visual acuity and prescription as your blood sugar levels fluctuate.

Cataracts alter how light passes through the front of your eye to the back. This pathway change will affect your prescription in different ways depending on what type of cataract(s) that you have.

Medications can change a person’s prescription in one of three ways: 1) spasm of the muscle located towards the front of the eye called the ciliary muscle, 2) retention of fluid in the crystalline lens or 3) swelling of the ciliary processes towards the front of the eye. The list of medications that can cause changes to your prescription and visual acuity is too lengthy to list in this forum.

Dry eyes can cause changes in prescription and/or fluctuations in visual acuity because of this condition’s effect on the front surface of the eye. The cornea plays an important role in focusing light to the proper place in the back of the eye. As a matter of fact, the cornea accounts for 65-75 percent of the eye’s prescription. Consequently, changes to the cornea due to dry eye can have a profound effect on visual acuity and/or prescription.

Changes in prescription seen in pregnancy can be temporary or long-lasting. The hormones that are released during pregnancy can change corneal thickness, corneal curvature, how the crystalline lens transmits light to the back of the eye and how the front eye muscles focus light. Some women experience changes in myopia (nearsightedness), hyperopia (farsightedness) or astigmatism. There has even been a published case in which one woman experienced an increase in myopia during the first trimester only to experience a swing to hyperopia in her second and third trimester.

The length of the eyeball is known as axial length. Increasing axial length is a common reason for changes in prescription seen in children up to the age of twenty-two years. Clinical studies seem to indicate that multiple factors working in concert result in changes to axial length rather than just one component being the culprit. Every one millimeter change equates to a three diopter change in prescription.

Spasms of the ciliary muscle will change the shape of the crystalline lens. This change in shape will result in changes in prescription and visual acuity. These spasms can be temporary or longer-lasting in different individuals. Different medications as well as inefficient focusing visual systems can cause these spasms of the ciliary muscle. This can cause transient changes in how you see through your glasses or contacts, or it can cause your prescription to change from one doctor visit to another.

For more information, please contact Dr. Edward Fong and the Sugar Land, TX eye doctors and optometrists at Bright Eye Care & Vision Development.

References:

  1. Ranabir S and Reetu K. Stress and hormones. Indian J Endocrinol Metab. 2011 Jan-Mar; 15(1): 18–22.
  2. Omoti AE, Waziri-Erameh JM, Okeigbemen VW. A review of the changes in the ophthalmic and visual system in pregnancy. Afr J Reprod Health. 2008 Dec;12(3):185-96.
  3. Ekpenyong BN, Aruotu NA, Uzodike EB, Njoku CG. Clinical Investigations and Management of Refractive Changes in Pregnancy: A Case Report. Afr J Reprod Health. 2015 Dec;19(4):107-17.
  4. Sunness JS. The pregnant woman’s eye. Surv Ophthalmol. 1988 Jan-Feb;32(4):219-38.
  5. Eisner A, Burke SN, Toomey MD. Visual sensitivity across the menstrual cycle. Vis Neurosci. 2004 Jul-Aug;21(4):513-31.
  6. Oliver KM, Walsh G, Tomlinson A, McFadyen A, Hemenger RP. Effect of the menstrual cycle on corneal curvature. Ophthalmic Physiol Opt. 1996 Nov;16(6):467-73.
  7. Kiely PM, Carney LG, Smith G. Menstrual cycle variations of corneal topography and thickness. Am J Optom Physiol Opt. 1983 Oct;60(10):822-9.
  8. Soni PS. Effects of oral contraceptive steroids on the thickness of human cornea. Am J Optom Physiol Opt. 1980 Nov;57(11):825-34.
  9. K Pesudovs, D B Elliott. Refractive error changes in cortical, nuclear, and posterior subcapsular cataracts. Br J Ophthalmol 2003;87:964–967.
  10. Handa T, Mukuno K, Niida T, Uozato H, Tanaka S, Shimizu K. Diurnal variation of human corneal curvature in young adults. J Refract Surg. 2002 Jan-Feb;18(1):58-62.
  11. Read SA, Collins MJ. Diurnal variation of corneal shape and thickness. Optom Vis Sci. 2009 Mar;86(3):170-80.
  12. Yasuda A, Yamaguchi T, Ohkoshi K. Changes in corneal curvature in accommodation. J Cataract Refract Surg. 2003 Jul;29(7):1297-301.
  13. Benjamin, WJ. Borish’s clinical refraction 2nd edition. Butterworth-Heinemann, 2007. Print.

Medical Disclaimer. The information on this site is not intended or implied to be a substitute for professional medical advice, diagnosis or treatment. All content, including text, graphics, images and information, contained on or available through this website is for general information purposes only.