Description

The 78D Lens is an essential tool for ophthalmologists, designed for high-precision retinal examinations. Its primary function is to provide detailed views of the retina, optic disc, macula, and posterior pole, making it indispensable for fundus biomicroscopy and general ophthalmic diagnostics.

Key Features

• High Magnification: Offers greater magnification than the 90D lens, providing a balanced view with enhanced depth perception.
• Double Aspheric Design: Ensures clear, large, and undistorted images, forming a real, inverted image of the retina.
• Versatile Compatibility: Suitable for use with all standard slit lamps, available in multiple ring colors, and offered in both reusable and single-use versions.

Technical Specifications

• Field of View: Static range of 81°–98°, with a dynamic range up to 155° depending on the manufacturer.
• Image Magnification: Ranges from 0.77x to 0.98x.
• Working Distance: Approximately 7–8 mm.
• Material: Constructed from precision instrument-grade glass with optional anti-reflective coatings.

Usage Guidelines

Designed for non-contact use, the 78D Lens is most effective with pupil dilation, though it can still provide valuable insights without it. Proper positioning close to the patient's eye enhances the viewing angle without making contact.

Clinical Applications

Ideal for:

• Examining the optic nerve head, macula, and retinal arcades
• Diagnosing and monitoring glaucoma
• Conducting comprehensive posterior segment evaluations

Maintenance

To maintain optimal performance, clean the lens with mild, pH-neutral detergent and rinse with sterile water. Disinfection can be achieved with high-level disinfectants, and it is compatible with various sterilization systems. Avoid using alcohol, peroxide, or acetone on optical surfaces.

Storage

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.

Manufacturer Variations

Notable variations include models from Volk, Ocular Instruments, and Katena, each offering specific features such as different fields of view, magnification levels, and coatings. These variations allow practitioners to select a lens that best suits their clinical needs.

The 78D Lens remains a classic choice for practitioners seeking a versatile and reliable diagnostic tool, balancing magnification and field of view to meet diverse clinical requirements.