Healthcare Professionals, log in to see special pricing.

Physiological-Diplopia Cord™ (Brock String)


Item #: BC109+

Professional Pricing Available to Registered Healthcare Professionals, Schools, & Government. Click on the blue info button for more details.


Physiological-Diplopia Cord™

(Similar to Brock String)

Inexpensive home use instrument for near training as well as to extend phy-dip training from near into distance. Utilizes physical diplopia for training suppression, binocularity and spatial localization. Heavy cord with colored beads. Sold by the dozen in 10' or 20' lengths.

10 Foot Lengths have 3 beads:
• Red
• Yellow
• Green

20 Foot Lengths have 6 beads:
• Red
• Yellow
• Green
• Blue
• White
• Black

10 Foot Lengths have 3 beads:
• Red
• Yellow
• Green

20 Foot Lengths have 6 beads:
• Red
• Yellow
• Green
• Blue
• White
• Black

Disclaimer: Please note that the products offered on our website have not been evaluated or reviewed by the United States Food and Drug Administration (FDA), unless explicitly stated otherwise. The information provided on this website is for informational purposes only and is not intended to diagnose, treat, cure, or prevent any disease or medical condition. The products offered on our website are not intended to replace or substitute any advice, diagnosis, or treatment provided by a qualified healthcare professional. It is strongly encouraged that any use of our products in an effort to improve visual skills only be done so under the guidance and supervision of a qualified healthcare professional. Although we at Bernell choose to sell our products exclusively to healthcare professionals as they are our target market, we strongly advise that anyone who may come across our products on a secondary market consult with a qualified healthcare professional before using any product. Additionally, we do not offer instructions for intended use, nor make claims for healthcare professionals, in how to diagnose, treat, cure, or prevent any disease or medical condition with our products. The majority of the items offered under vision therapy or vision training categories on this site fall under the FDA's General Wellness: Policy for Low-Risk Items. For safety reasons, we do not condone the use any of our products that occlude or restrict vision in any way while participating in activities that may require unrestricted vision.

Additional Products

Comfort Grip Handle for Brock Strings - Pack of 3


Item #: BC109H3N

To access product pricing and add items to your shopping cart, please log in to your Bernell Online account. Click here to proceed with account login, or for further details, tap the blue information button

Plastic handle for your brock string. The knotted end of the brock string easily slips into the handle's grove and is securely held in place. The Brock String Handle makes it much easier for patients to hold when working with them. Quickly installs in less than 5 seconds.

Sold 3 handles per package. Brock Strings sold separately.

See video in "Videos" tab below for how to install.

• Package Includes: 3 plastic handles
• Color: Navy Blue

Disclaimer: Please note that the products offered on our website have not been evaluated or reviewed by the United States Food and Drug Administration (FDA), unless explicitly stated otherwise. The information provided on this website is for informational purposes only and is not intended to diagnose, treat, cure, or prevent any disease or medical condition. The products offered on our website are not intended to replace or substitute any advice, diagnosis, or treatment provided by a qualified healthcare professional. It is strongly encouraged that any use of our products in an effort to improve visual skills only be done so under the guidance and supervision of a qualified healthcare professional. Although we at Bernell choose to sell our products exclusively to healthcare professionals as they are our target market, we strongly advise that anyone who may come across our products on a secondary market consult with a qualified healthcare professional before using any product. Additionally, we do not offer instructions for intended use, nor make claims for healthcare professionals, in how to diagnose, treat, cure, or prevent any disease or medical condition with our products. The majority of the items offered under vision therapy or vision training categories on this site fall under the FDA's General Wellness: Policy for Low-Risk Items. For safety reasons, we do not condone the use any of our products that occlude or restrict vision in any way while participating in activities that may require unrestricted vision.


GTVT Brock Strings


Item #: FR+

Professional Pricing Available to Registered Healthcare Professionals, Schools, & Government. Click on the blue info button for more details.

The GTVT Brock String is a premium version of the traditional Brock String, designed for easy use by both doctors and patients. It includes five colored beads—red, green, yellow, blue, and orange—to support a variety of binocular vision and visual skills activities.

Available in both 6 ft. and 12 ft. lengths, the GTVT Brock String offers flexibility for different therapy setups and working distances. The beads are slightly smaller in diameter than those used on our standard BC1090 and BC1092 Brock Strings, providing a lighter, easy-to-handle design.

The GTVT Brock String is available individually or in a set of 12.

Available in 6' or 12' Length

• Sold by the Dozen or Individually

Disclaimer: Please note that the products offered on our website have not been evaluated or reviewed by the United States Food and Drug Administration (FDA), unless explicitly stated otherwise. The information provided on this website is for informational purposes only and is not intended to diagnose, treat, cure, or prevent any disease or medical condition. The products offered on our website are not intended to replace or substitute any advice, diagnosis, or treatment provided by a qualified healthcare professional. It is strongly encouraged that any use of our products in an effort to improve visual skills only be done so under the guidance and supervision of a qualified healthcare professional. Although we at Bernell choose to sell our products exclusively to healthcare professionals as they are our target market, we strongly advise that anyone who may come across our products on a secondary market consult with a qualified healthcare professional before using any product. Additionally, we do not offer instructions for intended use, nor make claims for healthcare professionals, in how to diagnose, treat, cure, or prevent any disease or medical condition with our products. The majority of the items offered under vision therapy or vision training categories on this site fall under the FDA's General Wellness: Policy for Low-Risk Items. For safety reasons, we do not condone the use any of our products that occlude or restrict vision in any way while participating in activities that may require unrestricted vision.

Sports Brock String


Item #: BSPDTC+

Professional Pricing Available to Registered Healthcare Professionals, Schools, & Government. Click on the blue info button for more details.

Sports Brock String is a fun and engaging variation of the classic Brock String designed for visual skills activities involving eye alignment awareness, convergence, fixation, and spatial judgment. The unique sports-themed beads help increase interest and participation, making it a great option for athletes, students, and home users.

The 10-foot heavy-duty black cord provides a high-contrast background that makes the beads easier to see in a variety of environments. The extended length allows activities to be performed at both near and farther viewing distances, while the comfortable red handle provides a secure grip during use.

Compact, portable, and easy to set up, the Sports Brock String is ideal for use at home, in the office, or on the field as part of a visual skills training program.

  • Sports-themed bead design for increased engagement
  • 10-foot heavy black cord for excellent visibility and durability
  • Suitable for near and distance visual skills activities
  • Portable and easy to use at home, in the office, or while traveling
  • Comfortable red handle provides a secure grip

Disclaimer: Please note that the products offered on our website have not been evaluated or reviewed by the United States Food and Drug Administration (FDA), unless explicitly stated otherwise. The information provided on this website is for informational purposes only and is not intended to diagnose, treat, cure, or prevent any disease or medical condition. The products offered on our website are not intended to replace or substitute any advice, diagnosis, or treatment provided by a qualified healthcare professional. It is strongly encouraged that any use of our products in an effort to improve visual skills only be done so under the guidance and supervision of a qualified healthcare professional. Although we at Bernell choose to sell our products exclusively to healthcare professionals as they are our target market, we strongly advise that anyone who may come across our products on a secondary market consult with a qualified healthcare professional before using any product. Additionally, we do not offer instructions for intended use, nor make claims for healthcare professionals, in how to diagnose, treat, cure, or prevent any disease or medical condition with our products. The majority of the items offered under vision therapy or vision training categories on this site fall under the FDA's General Wellness: Policy for Low-Risk Items. For safety reasons, we do not condone the use any of our products that occlude or restrict vision in any way while participating in activities that may require unrestricted vision.

Call Toll Free 1-800-348-2225 or (574) 259-2070

Fax to (574) 259-2102 or (574) 259-2103

sectigo_secure_seal