Description

The 20D Large Lens is an essential tool in the field of ophthalmology, designed for indirect ophthalmoscopy. This hand-held lens is widely recognized for its ability to provide a comprehensive view of the retina, making it invaluable for both general diagnosis and treatment.

Key Features

• Dioptric Power: With a dioptric power of +20D, this lens offers a balanced combination of magnification and field of view, crucial for detailed retinal examination.
• Image Inversion: It produces an inverted image, both horizontally and vertically, which is standard for lenses of this type.
• Single-Element Design: Typically crafted from a single piece of optical glass encased in a metal ring, ensuring durability and ease of handling.

Practical Applications

The 20D Large Lens is suitable for use with a binocular indirect ophthalmoscope (BIO), allowing for effective stereoscopic analysis of the retina. Its design makes it particularly useful in examining patients with nystagmus or when scleral indentation is required. The lens provides:

• Wide Field of View: Enabling visualization up to the mid-peripheral region of the retina.
• Effective Retinal Scanning: Ideal for examining the retinal periphery or posterior pole.

Handling and Maintenance

The lens is easy to manipulate during examinations, thanks to its robust construction. Available in various colors, the metal ring's hue is purely cosmetic and does not impact functionality.

Cleaning and Care

• Cleaning: Recommended to clean with alcohol wipes and avoid abrasive materials.
• Sterilization: Should not be steam autoclaved or boiled. Suitable for sterilization with ethylene oxide gas or compatible low-temperature systems.
• Storage: Store in a clean, dry environment and inspect for damage before each use.

Additional Considerations

Repeated sterilization may cause color fading in the metal ring, and any polyacetal or plastic components may have a limited lifespan under such conditions. Proper care ensures the lens remains a reliable asset in clinical settings.

The 20D Large Lens stands out as a versatile and reliable choice for ophthalmic professionals, offering clarity and precision in retinal examinations across a range of patient needs.