Description

The Fresnel Press-On Prism by 3M offers a versatile solution for managing various visual disorders through prismatic correction. Crafted from optical-grade polyvinyl chloride (PVC), this ultra-thin, flexible sheet is designed to adhere seamlessly to the inner surface of spectacle lenses, providing a discreet and effective means of addressing conditions such as strabismus and diplopia.

Key Features

• Ultra-Thin Design: With a thickness of less than 1 mm, the prism maintains a lightweight profile, minimizing any additional burden on the eyeglass lens.
• Customizable Fit: Easily cut to match the shape of most lenses, up to a diameter of 64 mm, ensuring a tailored fit for individual needs.
• Simple Application: Adheres using water without the need for adhesives, allowing for straightforward application, repositioning, and removal.
• Wide Range of Powers: Available in prism powers typically ranging from 0.5 to 30 diopters, with some variations offering up to 40 diopters, catering to diverse corrective requirements.

Intended Use

The Fresnel Press-On Prism is particularly beneficial for:

• Correcting eye misalignment and double vision.
• Expanding visual fields in cases of hemianopia.
• Serving as a temporary or diagnostic tool before or after strabismus surgery.

Eye care professionals, including orthoptists, ophthalmologists, and optometrists, frequently utilize this prism for both therapeutic and diagnostic purposes.

Application Instructions

1. Preparation: Clean both the spectacle lens and the prism.
2. Submersion: Submerge in lukewarm water.
3. Attachment: Press the smooth side onto the lens, avoiding air bubbles.
4. Trimming: Cut slightly smaller than the lens to prevent overlap.
5. Drying: Allow to dry for secure adhesion.

The prism can be removed, cleaned, and reapplied as necessary, providing flexibility in its use.

Maintenance

• Cleaning: Use soap and water, with a soft toothbrush for the grooved side.
• Avoidance: Refrain from using lens wipes to prevent damage.

Considerations

While highly effective, users should be aware of potential limitations such as:

• Cosmetic visibility on the lens.
• Cleaning challenges, particularly on the grooved side.
• Possible chromatic aberrations and slight blurring at higher powers.

Proper care and correct orientation, as prescribed, will enhance the longevity and effectiveness of the prism, making it a valuable tool in visual rehabilitation.