Benefits of Customizing Prism with Custom Soft Toric Contact Lenses

Each soft contact lens manufacturer determines the amount and location of prism in their soft toric contact lens designs.  Specialeyes has chosen a base down prism ballast approach for their custom soft toric and multifocal toric contact lenses.  Each SpecialEyes lens comes standard with 1.0 diopter of base down prism.  Reference the shaded gray area within the image below for depiction of prism.

SpecialEyes Custom Soft Toric Contact Lenses

SpecialEyes Toric Custom Soft Contact Lens Design

What sets SpecialEyes’ design apart from many of the other custom soft toric contact lenses on the market today is the company’s ability to vary or customize the amount of prism in their lenses.  SpecialEyes can vary the amount of base down prism in 0.10 diopter increments up to 4.0 diopters.  It is even possible to add prism to a SpecialEyes custom soft spherical contact lens as well.

You may be asking yourself, why would I ever need to alter the amount of prism in a sphere, toric or multifocal toric contact lens?  Great question!  There are two reasons that stand out.  At SpecialEyes we sometimes run across fitting situations where the contact lens fit from a centering and movement on blink perspective appears optimal via slit lamp examination but the lens tends to fluctuate in rotation thus creating instability and fluctuating vision.  In this type of situation the base curve and diameter may have already been altered to try and improve fit, yet the unstable rotation still exists.  It is in this exact scenario where an increase in the amount of base down prism will help to stabilize the toric or multifocal toric contact lens.

If you find a similar fitting scenario as the one above and feel an increase in base down prism is necessary, start by increasing the prism in 0.25 diopter steps.  A general rule to follow is that the higher amount of fluctuating rotation, the greater amount of additional prism will be needed to correct the unstable lens.

Another scenario where adding additional prism to soft toric contact lenses may prove beneficial is for treating a binocular dysfunction such as vertical heterophoria which is a vertical misalignment of the eyes causing vertigo, double vision, headaches, fatigue, etc.

So, if you experience unstable rotation issues while fitting custom soft toric contact lenses or have a patient with a binocular dysfunction consider adding additional prism to the contact lens if warranted.

Sincerely,

The SpecialEyes Team

21 thoughts on “Benefits of Customizing Prism with Custom Soft Toric Contact Lenses

    1. SpecialEyes Post author

      Hi Brittne, Thanks for reaching out! SpecialEyes is only able to apply base down prism in our contact lenses. I do not think that base down prism can be used for a horizontal eye misalignment. But that is outside our scope of practice so for a more definitive answer, I would reach out to a licensed eye care provider and inquire. We do have practitioners that utilize the base down prism in our contact lenses for vertical misalignment. I hope that helps! Thanks!

      Reply
    1. SpecialEyes Post author

      Hi Linda, Thanks for reaching out to SpecialEyes! Prism is available in our contact lenses however, SpecialEyes is only able to apply base down prism in our contact lenses. I am not sure that this type of prism is appropriate for your needs. For a more definitive answer, I would reach out to a licensed eye care provider. I hope this helps! Thanks again!

      Reply
  1. John G

    Hi. My eyeglass prescription includes a 7 or 8 diopter BASE OUT prism in both lenses.

    Do you have any plans to offer a contact lens with this?

    Thanks.

    Reply
    1. SpecialEyes Post author

      Hi John, Thank you for reaching out to SpecialEyes! At this time, I am not aware of any plans to incorporate base out prism into our custom soft contact lenses. I recommend consulting without to a licensed eye care provider to find out what other options you might have. Thanks again!

      Reply
  2. lowell hawes

    Hi, I have 1.5 bd in one lens and 1.5 bu in the other. This is in my glasses so I don’t know what it would be in contacts but I wanted to know if you can add bu and bd in your contacts. Thanks lowell

    Reply
    1. Lindsay McCorkle

      Hi Lowell,

      Thanks for reaching out to SpecialEyes! Prism is available in our contact lenses however, SpecialEyes is only able to apply base down prism in our contact lenses. I am not sure that this type of prism is appropriate for your needs. For a more definitive answer, I would reach out to a licensed eye care provider. I hope this helps!

      Thanks again!

      Reply
  3. Monica holbrook

    How expensive are these lenses. Have a child that needs prism lenses for his depth perception. Will not wear sport glasses. H

    Reply
    1. SpecialEyes Post author

      Hi Monica,

      Thank you for reaching out to SpecialEyes! I have sent you an email regarding your comment. Please let me know if I can be of further assistance.

      Thanks again!

      Reply
  4. Patty

    Do you offer toric multifocals with a prism to vertical heterophoria? What happens if my provider orders them for me? Will I get a trial pair to ensure good fitting or if they don’t fit correctly, will I be charged full price? Before o knew I neede prism, I had worn soft lenses for years and one eye seemed to require an adjustment with a trial first. I got glasses with prism several months ago, but I really miss contacts and am ready to pay for that luxury if available. Can you estimate pricing? I’m 20/400 with astigmatism and require prisms now

    Reply
    1. SpecialEyes Post author

      Hi Patty,

      Thank you for reaching out to SpecialEyes! I have sent you an email regarding your comment. Please let me know if I can be of further assistance.

      Thanks again!

      Reply
  5. Tammy D Truby

    I am wearing glasses right now but I would like to try contacts. My glasses have prism in them so I need them in my contacts as well. I have a old prescription that expired on March 31, 2017
    Could you please give me information on how to pick the right contact for my needs. Thank you.

    Reply
    1. SpecialEyes Post author

      Good morning Ms. Truby,

      Thank you for reaching out to SpecialEyes! I have sent you an email regarding your request for information. Please let me know if I can be of further assistance and have a wonderful day!

      Thanks,
      SpecialEyes

      Reply
  6. Jennifer Jameson

    I just recently got new prism glasses after finding out I have double vision. My eye doctor said they can’t put a prism in contacts. If your company can, in fact, how much do they run?

    Reply
    1. SpecialEyes Post author

      Good morning Ms. Jameson,
      Thank you for reaching out to SpecialEyes! I have sent you an email regarding your request for information. Please let me know if I can be of further assistance, and have a wonderful day!
      Best regards,
      SpecialEyes

      Reply
    1. SpecialEyes Post author

      Hi John,

      Thank you for reaching out to SpecialEyes! At this time SpecialEyes only offers base down prism. Please let me know if I can be of further assistance. Have a wonderful day!

      Best regards,
      SpecialEyes

      Reply
  7. Joanne Seiff

    I would appreciate some help.
    I have Graves Disease. In control for the past many years. I was left with double vision ( when looking with both eyes) and an astigmatism in my left eye.
    Am I able to wear your contact lenses? I have worn glasses with a prism for years now, and have tried monovision .. doesn’t work well for me.
    Any suggestions?
    Joanne Seiff

    Reply
    1. SpecialEyes Post author

      Hi Joanne,
      Thank you for reaching out to SpecialEyes! I have sent you an email regarding your request for information. Please let me know if I can be of further assistance, and have a wonderful day!
      Best regards,
      SpecialEyes

      Reply

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