👓 Here’s more on a 20D lens:
- Magnification: A +20D lens provides approximately 20x magnification.
- Field of view: Offers a relatively wide field, useful for examining the retina.
- Use: Commonly used in ophthalmology for:
- Indirect ophthalmoscopy (with a slit lamp or head-mounted scope).
- Examining the posterior segment (retina, macula, etc.).
- Type: Typically a handheld, convex lens made of glass or acrylic.
- Working distance: Around 5 cm (2 inches) from the patient’s eye.
