Contact Lens Fitting Exam

Standard Contact Lens Exam

All eye exams begin with a comprehensive exam that includes a prescription for glasses. Contact lens exam requires the Optometrist or Ophthalmologist to transpose your prescription to accommodate an optimized and comfortable contact lens experience. Your contact lens prescription considers comfort, vision, and daily tasks. Contact lens eye exams usually require a follow up exam for patients new to contact lenses and patients that are experiencing a change in prescription. Depending on the prescription and contact lens type, contact lens exams may require multiple visits to assure patient needs are met. Some first-time or beginners to contact lenses may need several training sessions.

What’s different about the contact lens prescription that my glasses prescription doesn’t cover?
Your contact lens prescription will include information about the type of lens (soft, hard, scleral, or other specialty lens), and the shape and size best suited for your eye (curvature, diameter parameters of the lens). Your contact lens prescription is optimized for comfort, vision, and daily tasks.
Calculate the right prescription | Lens Power
Even though you know your glasses prescription, your contact lens prescription oftentimes is not the same.
Considerations for the shape of your eye
Not every eye is the same. Depending on the curvature of your eye, your doctor will select the best lens shape for you. If the curvature of the contact lens is too flat or steep for the shape of your eye, you could experience discomfort or damage to your eye.
Considerations for the type of contact lens
  • There are many types of contact lenses: soft, spherical, toric, daily, monthly, rigid contact lenses, scleral lenses. We take into consideration your vision, lifestyle, prescription, and visual symptoms to select the best lens for you.
  • Soft vs Rigid Contact Lenses: Soft contact lenses are typically more comfortable initially and have a regular replacement schedule. Rigid lenses are more durable, can offer more crisp vision and improved oxygen to the eyes, but may initially feel less comfortable.
  • Spherical vs. Toric Lenses: Based on the amount of astigmatism you have, you may need toric lenses to maximize the clarity of your vision through contacts. Patients without astigmatism or with minimal astigmatism may wear spherical lenses and still have clear vision.
  • Replacement Schedule: Daily, Bi-weekly, or Monthly lens replacement are considered based on your lifestyle, how often you want to wear lenses and for what activities you do while wearing lenses.
  • Scleral lenses: These specialty lenses are uniquely designed for patients with corneal disorders such as keratoconus.
Pupil and Iris Measurements
The size of your pupil and iris may also be measured as part of your contact lens eye examination. Pupil and iris measurements factor into the size of your contact lenses. Contact lenses that are of a proper size will fit well and look best on your eyes.
Evaluating Overall Eye Health, are your eyes suitable for contact lens wear?
  • Using the slit lamp we will evaluate the overall health of your cornea. Are you having allergies, are there any active infections? Is the front surface of your eye healthy enough for contact lenses?
  • Tear Film Evaluation: Determining if you have Dry Eye or experience symptoms of dryness. If the lenses are not kept adequately hydrated and moist, they will become uncomfortable and your eyes will feel dry, irritated and itchy. In cases of severe dry eye, contact lens wear is uncomfortable and may not be recommended. This portion of the exam helps us protect your eyes.
  • Visible Signs of Contact Lens Abuse: over time with decades of contact lens wear or overwear, we may begin to see damage to the eye such as Pannus and/or corneal neovascularization, signs that the eye is starved for oxygen. Recommendations: discontinue contact lens wear, do not overwear contact lenses. Do take care of contacts by paying attention to your cleaning regimen and replacing them on time.
  • Corneal Ulcer: This is the contact lens wearer’s worst nightmare. A corneal ulcer is an erosion of the cornea and can be caused by contact lens abuse or infection. Where healthy tissue should be there is a hole. This is painful and can cause symptoms of tearing, discomfort, redness, and pain. This can be caused by contact lens overwear, abuse, or poor hygiene. Active infection could result in loss of vision/eye.

Toric Contact Lens exam

Based on the amount of astigmatism you have, you may need toric lenses to maximize the clarity of your vision through contacts. Toric contact lenses have special markings on them to show if the contact lens is aligning correctly on the eye. If the contact lens is not in alignment, blurry vision may occur and a different contact lens brand or prescription may be needed. This is one reason why glasses and contact lens prescriptions may not be the same. Another reason glasses and contact lens prescriptions may not be the same is that while glasses can be made to very specific degrees of astigmatism (i.e. -2.00 x087), soft contacts come in pre-fabricated amounts of astigmatism (typically -0.75, -1.25, -1.75, -2.25) and offer an axis every 10 degrees (i.e -1.75 x080 or -1.75 x090).

Medical Contact Lens Exam (RGP, Scleral, Specialty Lenses)

Patients who have high refractive error (especially astigmatism), or keratoconus, or other corneal diseases or degenerations will benefit from a medical contact lens examination. Because the cornea is an important refractive surface, any corneal irregularities can cause blurred images, ghosting, and uncomfortable glare. After careful evaluation of the cornea, a specialty lens can be fitted to improve visual clarity better than what can typically be seen with glasses alone. Rigid lenses can be made very specifically to fit the curvature of the eye. Scleral lenses are specialty lenses that vault the irregular cornea entirely, offering a smooth refracting surface.

Contact lens types

There are different types of contact lenses available to accommodate eye conditions and patient preferences. Each type of contact lenses serve a unique purpose to help patients with achieving maximum visual acuity. It is always important to consult with a vision physician to evaluate the health

  • What is an RGP?
  • Why are RGP contact lenses recommended?
    • Standard
      • RGP contact lenses are made of ……
      • pros/cons
    • Hybrid (soft edges)
      • Hybrid RGP Contact lenses are made of……
      • pros/cons
    • Double ridge (the kind I am trying as I type :)
      • Double ridge RGP Contact lenses are made of……
      • pros/cons
  • What is a Sclerals contact lens?
  • Why are Sclerals contact lenses recommended?
    • Regular
      • Scleral contact lenses are made of …..
      • pros/cons
    • Mini
      • Mini Scleral Contact lenses are made of……
      • pros/cons
  • What are disposable contact lens?
  • What are disposable contact lenses made of?
  • What are the different types of contact lenses?
    • Dailies

      What is the difference?

      • Solution
      • Thickness
      • other?
    • Biweekly

      What is the difference?

      • Solution
      • Thickness
      • other?
    • Monthly

      What is the difference?

      • Solution
      • Thickness
      • other?

Contact Lens Exam Conclusion

After taking careful measurements and determining the health of your eyes, your doctor will select and choose a pair of trial lenses that would work best with your eyes. A trial lens is included with every contact lens exam with us. After placing the lenses on, the doctor exams the fit, movement and tearing in your eye. The doctor’s goal is to confirm good vision, fit, and comfort. If the lenses do not appear to be a good fit, the lens or prescription can be adjusted and another lens fitted. Once the lenses are fit, you can keep the trial pair and your contact lens prescription will be finalized and ordered. It is common to schedule a follow-up appointment to check that your updated or new contact lenses are comfortable, fitting properly, and providing good vision.

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World Optic
Phone: +1 714-871-2020
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2443 E. Chapman Ave.
Fullerton, CA 92831