Description

The 20D Large Lens is a renowned tool in the field of ophthalmology, primarily used for indirect ophthalmoscopy. It is highly valued for its ability to provide a comprehensive view of the retina, macula, and optic nerve, making it an essential instrument for detailed retinal examinations.

Key Features

• Magnification and Field of View: This lens offers a well-balanced compromise between magnification and field of view, allowing for effective examination in both adult and pediatric patients.
• Ease of Use: Its design facilitates ease of manipulation, making it suitable for use when slit lamp examination is not feasible.

Optical Specifications

• Dioptric Power: +20 diopters
• Field of View: Approximately 46° to 60°
• Image Magnification: Around 3.13x
• Working Distance: 47–50 mm from the cornea

Design and Build

The lens features biconvex, double aspheric glass optics with anti-reflective coatings on some models, enhancing image clarity. The clear aperture and overall dimensions are designed to provide optimal performance, with some models offering a clear aperture of Ø47 mm.

Color Options

Available in a variety of colors, including Black, Blue, Gold, Green, and more, the lens can be customized to suit personal preferences. Engraving options are also available for further personalization.

Maintenance and Sterilization

The 20D Large Lens can be cleaned using alcohol wipes and disinfected with solutions such as glutaraldehyde or bleach. It is compatible with sterilization methods like ethylene oxide gas but should not be steam autoclaved or boiled. Proper maintenance includes manual cleaning, rinsing with sterile water, and drying with lint-free tissues.

Certifications

Some models come with certifications such as CE, FDA, and ISO13485, ensuring compliance with industry standards.

Customization and Accessories

The lens is available in both single-use and reusable designs, with some models including a single-lens case. Customization options include engraving, providing up to 14 characters on the lens and 17 on the case.

Common Applications

This lens is commonly used for:

• Retinal examinations in various settings
• Pediatric examinations
• Laser procedures
• Fundus biomicroscopy

Its versatility makes it suitable for use in operating rooms or NICUs, particularly the single-use variant.

General Maintenance Guidelines

Store the lens in a clean, dry environment at room temperature. Inspect for damage before each use to ensure optimal performance and safety.

The 20D Large Lens remains a trusted choice for ophthalmic professionals, offering high-quality imaging and reliable performance across a range of diagnostic and treatment applications.