Description

The 28D Large Lens is an essential tool for ophthalmic professionals, designed to enhance retinal examinations with precision and clarity. Its aspheric, non-contact design is tailored for use with a binocular indirect ophthalmoscope (BIO), providing a comprehensive view of the retina, including peripheral regions. This makes it particularly valuable in pediatric examinations, such as those involving retinopathy of prematurity, and in cases where slit lamp examination is not feasible.

Key Features

• Wide Field of View: With lower magnification compared to a 20D lens, the 28D Large Lens offers a broader field of view, allowing for detailed assessment of the peripheral retina. This feature is crucial for diagnosing retinal defects and managing conditions in patients with small pupils or nystagmus.
• Compact Design: Its small diameter facilitates easy manipulation within the orbit, making it suitable for both pediatric and geriatric patients. The lens is available in various colors, including Black, Blue, Gold, and more, with options for special editions like the 50th Anniversary Champagne Gold.
• Versatile Models: Available in autoclave sterilizable (ACS®) or single-use designs, some models include patented double aspheric glass optics for superior imaging. Additional features may include a silicone grip for enhanced control and optional engraving for personalization.

Technical Specifications

• Lens Power: 28 diopters (28D)
• Field of View: 53° (static) / 69° (dynamic)
• Image Magnification: 2.1x to 2.27x
• Working Distance: 33 mm
• Construction: Made from glass or PMMA, with anti-reflection coating on select models

Maintenance and Sterilization

The lens supports various sterilization methods, including Ethylene Oxide, Steam Sterilization, and systems like Sterrad® and V-Pro®. Proper cleaning involves using mild, pH-neutral detergents and recommended products like Volk Precision Optical Lens Cleaner. High-level disinfectants such as CaviWipes and Tristel Duo OPH are suitable for disinfection.

Additional Considerations

• Storage: After cleaning, store the lens in a clean, dry environment at room temperature. Note that colored rings may discolor with certain disinfectants, though this does not impact functionality.
• Accessories: A complimentary single-lens case is included, but non-sterilizable cases should not undergo sterilization.

The 28D Large Lens stands out as a versatile and reliable instrument for ophthalmologists, offering exceptional performance in diverse clinical settings. Its thoughtful design and robust features ensure it meets the demanding needs of retinal examination with ease and efficiency.