Fundus Double Aspheric Lens

*Double Aspheric Fundus Lenses (20D, 78D, 90D)*

Double aspheric fundus lenses, including the 20D, 78D, and 90D, are essential tools in ophthalmology for examining the retina with clarity and precision. These lenses are specifically designed to enhance the image quality during indirect ophthalmoscopy and slit lamp biomicroscopy, offering optimized magnification and a wide field of view.

1.⁠ ⁠*20D Lens*: Known for its balanced performance, the 20D lens provides approximately 3x magnification with a 46° field of view. Its design allows for a comprehensive view of both the central and peripheral retina, making it ideal for general retinal examinations. With a working distance of about 50 mm, this lens offers detailed visualization while maintaining a comfortable distance from the patient's eye.

2.⁠ ⁠*78D Lens*: The 78D lens offers around 0.93x magnification with an 81° field of view, allowing for enhanced imaging of the retina with a moderate level of magnification. This lens is particularly effective for detailed views of the optic nerve and posterior pole. It is a popular choice in clinical practice, balancing detailed retinal imaging with a wide viewing area.

3.⁠ ⁠*90D Lens*: With a lower magnification (0.76x) and a broader field of view (74°), the 90D lens is designed for a comprehensive wide-angle view, ideal for rapid retinal assessments. It is especially helpful for examining the optic nerve head and posterior pole and is frequently used in slit lamp examinations due to its shorter working distance and high-quality imaging.

These lenses’ double aspheric design reduces distortions, ensuring crisp, high-resolution images across the entire field.