BILL HENSHAW, OD, FCOVD
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Eyestrain (Vergence Anomaly)

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EYESTRAIN (Vergence Anomaly)

Eyestrain is a condition that makes it difficult to concentrate and move both of your  eyes in coordination at the same time. The strain results from difficulty holding your eyes together  as  a team.

 Reading and driving are two examples that require moving your eyes and  concentrating at the same time.
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The term vergence anomaly comes from the term convergence (turning your eyes inward at one spot). Vergence is the movement of the eyes together either in an  inward or outward direction. When the eyes turn outward, it is called divergence. In normal function it is easy to turn your eyes either inward or outward. Difficulty turning the eyes inward or outward is not normal.  Thus, we call that an anomaly giving the term vergence anomaly.  However, I prefer to call it eyestrain.

When you have eyestrain, you must close down your side vision and intensely center your eyes on the task you are trying to accomplish. This causes much fatigue and can lead to further vision problems.

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EYE STRAIN MAY RESULT IN THE FOLLOWING SYMPTOMS:

1. You may be readily absorbed in favorite activities such as television or reading.



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2. You may get a stiff neck.

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3. You may be easily distracted by external factors when doing a task. (ie: other people  talking while you are reading)

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4. Headaches are common.

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5. You may always want your shoulders massaged.


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6. It may be difficult to drive while others talk, especially if they talk to you.

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7. You often reread for understanding.






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​8.
You tend to be overly startled by sudden noises or movements.

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​9. Teeth clenching is common.





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​​10. Difficulty organizing often occurs.

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11. You may have a need for multiple stimulation, like constantly changing T. V. channels or listening to music while reading. Some can’t even study without the TV running in the background.

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12.  You have difficulty relaxing.

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13. You are noted for being "uptight."

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WHAT IS THE FIRST STEP?  (LENS THERAPY)

For many special glasses to prevent eyestrain while doing desk and digital work can be a big help. Lens therapy relaxes your eyes by making the reading material appear further away and thus less stressful.

Some need more than lens therapy alone, and they must learn how to eliminate the strain within their eyes. That requires vision therapy - learning how to use your eyes in a stress free, relaxing, and efficient way.

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WHAT IS THE SECOND STEP?  (DIAGNOSTIC TESTING)       

Diagnostic testing helps Dr. Henshaw detect if vision therapy is right for you and then which method of vision therapy would be best for you.

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It also shows your vision problem to you. You may bring an observer, usually a spouse, whom you wish to understand your vision condition. For children we ask for a parent to observe. The diagnostic testing not only helps the doctor determine your care but allows you to see how your eyes work, and make you more aware of your condition.

Contact Us:
801 S. Fairmont AV #5
Lodi, CA 95240
209-334-2020
fax: 209-333-2015
e-mail: billfcovd@gmail.com
Visit us on FaceBook at Bill Henshaw, OD, FCOVD
Office Hours:
Mon, Tue, Wed:   9:00am - 6:00pm (Lunch 12:00 PM to 1:00 PM
Thursday:    8:00am - 5:00pm (Lunch 12:00pm to 2:00 pm. The extra hour each Thursday is for staff training)  
Friday:    Limited to vision therapy only

Saturday:    closed
Notice of Privacy Practices
  • Home
  • Our Practice
    • Meet the Doctor
    • Let's make an appointment
    • Services We Provide >
      • In a nut shell
      • Just add seasoning
      • Real Optometry
      • Larry Fitzgerald His eyes did it!
      • More than 20/20
      • Languages : We got'em
      • Cataract Eye drops?
      • Concussion and Vision
      • Contact Lenses
    • Facilites & Equipment
    • So You Had Extra Testing... >
      • Tests You Had
      • Conditions You Have
      • Treatments Available
      • Referal We Made
    • Insurance Plans >
      • MEDI-CAL
      • MEDICARE
      • VA's COMMUNITY CARE
      • VSP
    • Payments & Fees >
      • Our Fees
      • Payments Accepted
    • Eye Glasses Guide
  • Vision Therapy
    • Dr. Henshaw discusses Vision Therapy
    • Methods to treat Eye turns
    • Lens Therapy Explained
    • Digital / Computer Vision
    • Light Therapy
    • Research in Vision Therapy
    • Tribute to Dr. Bob Pepper
    • Videos about Vision Therapy
    • VIP
    • What is Vision Therapy?
  • Teacher Parent Info
    • Optometry and Education
    • Timely Info
    • How to ID a Visually related Learning Problem
    • School Vision Screening Danger
    • I'm here from the government, and I'm here to help you!
    • 7 Steps to Preserve Your Child's Vision at School
    • 20/20 is only a begining
    • Between Home and Pre-School
    • The Ritilin Myth and others
    • Vision and Learning Month
    • Videos about Vision and Learning
    • The Digital Jungle
  • TESTIMONIES
  • Explanations and Videos About Your Diagnosis
    • Accommodative Infacility (elevator Problem -Kid)
    • Amblyopia aka "Lazy Eye"
    • Anisometropia
    • Astigmatism
    • Binocular Vision
    • Cataracts
    • Esophoria/Esotropia (crossed eyes)
    • Exotropia/Wandering Eye
    • Eyestrain
    • Farsightedness
    • Nearsightedness/Myopia
    • Presbyopia Adult Elevator Problem
    • Vision Processing
  • Patient Forms
  • Promotions
    • National Vision and Learning Month
    • Bill's Books >
      • Looking Over Mother's Shoulder
      • What Would Jesus See?
  • Special Events
    • open
    • COVID INCONSISTIENCIES
    • Confinement During COVID
    • VIP Program
    • Tax Savings
    • Employment Opportunities
  • Location
  • Studies and Articles
    • Acuvue Contacts Danger
    • Computer Vision
    • Vision Care Videos
    • Heading in Soccer
    • Infant Vision
    • The Mono-Vision Myth
    • LASIK
    • Ted Talk
    • 3-D Movies
    • Miscellaneous Articles
    • Vision and Counseling
    • Diabetic Diet
  • FAQ
  • WWJS articles
  • help
  • New Page
  • New Page