Description

The 20D Large Lens, crafted by renowned manufacturers Volk and Ocular Instruments, stands as a cornerstone in the field of ophthalmology. This lens is specifically designed for indirect ophthalmoscopy, providing exceptional performance in comprehensive retinal examinations. Its versatility makes it suitable for both adult and pediatric patients, offering clear visualization of the central and mid-peripheral retina.

Optical Excellence

• Double Aspheric Design: The lens features a double aspheric, biconvex design that ensures minimal optical aberrations, providing clear and accurate images.
• High-Quality Glass Optics: Constructed with low dispersion glass and anti-reflective coatings, the lens minimizes reflections and enhances image clarity.

Key Specifications

• Dioptric Power: +20 diopters
• Magnification: Approximately 3.13x image magnification with a laser spot magnification factor of 0.32x
• Field of View: Typically 46°/60°
• Working Distance: 47–50 mm from the cornea

Versatile Applications

The 20D Large Lens is ideal for a range of diagnostic purposes, including:

• Examination of the optic nerve and macula
• Scleral indentation
• Evaluation of patients with nystagmus
• Fundus biomicroscopy for conditions such as glaucoma and maculopathy

Design and Handling

• Comfortable Working Distance: Offers a balanced magnification and field of view, making it comfortable for examiners.
• Minimized Reflections: Provides unobstructed views, crucial for accurate diagnosis.
• Ease of Use: Compatible with head-mounted binocular indirect ophthalmoscopes, though not typically used with slit lamps.

Customization and Accessories

Available in a variety of colors, including Black, Gold, Purple, and more, the lens offers personalization options such as free engraving. It comes with a single-lens case and is available in steam autoclave sterilizable or single-use designs.

Notable Features

The 20D lens is widely recognized for its ease of manipulation and effectiveness, often considered the most used among BIO condensing lenses. It provides an optimal compromise between magnification and field of view, making it an indispensable tool for general diagnostic examinations. Some models offer specialized attachments for advanced measurement needs, further enhancing its utility in clinical settings.