Name of the Procedure:

Contact Lens, PMMA, Toric or Prism Ballast, Per Lens

Summary

This procedure involves the fitting of a specialized hard contact lens made of polymethyl methacrylate (PMMA) designed to correct astigmatism (toric) or stabilize the lens for those with severe vision correction needs (prism ballast). Each lens is custom-made to match the patient’s specific visual requirements.

Purpose

The primary purpose is to improve vision in individuals with refractive errors such as astigmatism or specific eye alignment issues by providing a stable and clear vision correction option. The goals are to enhance visual acuity and overall eye comfort.

Indications

• Moderate to severe astigmatism
• Corneal conditions that require a steadier lens solution
• Significant refractive errors where standard lenses do not suffice
• Patients who have not had success with other types of contact lenses

Preparation

• Comprehensive eye examination to measure and map the cornea
• Discussing medical history and current medications
• Potential halt of certain medications as advised by the eye care professional
• No specific fasting is required

Procedure Description

1. Initial consultation and eye assessment
2. Detailed corneal topography is performed to design the custom lens
3. The patient is fitted with a trial lens to ensure proper fit and vision correction
4. Adjustments are made based on initial fitting results
5. Final lenses are ordered and a follow-up fitting is scheduled
6. Careful instruction on inserting, removing, and caring for the lenses is provided

Duration

The fitting and assessment process typically takes 1-2 hours. Follow-up appointments for adjustments and final fitting may take additional time.

Setting

Performed in an ophthalmology or optometry clinic.

Personnel

• Optometrists or Ophthalmologists
• Ophthalmic technicians
• Opticians (for lens fitting and education)

Risks and Complications

• Discomfort or lens intolerance
• Risk of infection if proper hygiene is not maintained
• Dry eye symptoms
• Corneal abrasion if lenses are not properly handled
• Rare but possible damage to the cornea requiring medical intervention

Benefits

• Enhanced visual acuity and comfort, particularly for those with complex vision issues
• Long-term vision correction, often with reduced dependency on glasses
• Custom fits provide a tailored visual solution, improving overall quality of life

Recovery

• Initial adaptation period for lens comfort and visual adjustment
• Regular use and proper care of lenses as instructed
• Follow-up appointments to monitor eye health and lens efficacy
• Typically, no significant downtime required

Alternatives

• Soft contact lenses (less effective for severe astigmatism)
• Glasses (may not provide the same level of visual clarity for specific conditions)
• Laser eye surgery (LASIK/PRK) for permanent correction, if suitable
• Other types of rigid gas permeable (RGP) lenses

Patient Experience

• Mild discomfort expected during the initial adjustment period
• Improved vision and overall comfort after the acclimation period
• Education on proper lens care to prevent discomfort and complications
• Ongoing support from eye care professionals to ensure optimal results