Aspheric Lens 90D Ophthalmology Equipment Accessories

🔎 What is a “90D Aspheric Lens”

• It is a non-contact slit-lamp lens with “90D” referring to 90 diopters — a power that makes it suitable for examining the posterior segment (fundus) of the eye (retina, optic nerve head, macula, etc.).

• “Aspheric” means the lens surfaces are not purely spherical. Instead, their shape is designed to reduce optical aberrations (like spherical aberration), improving image clarity and reducing distortion compared to a simple spherical lens.

• Often these lenses are double-aspheric (both surfaces aspheric), which further enhances imaging quality.

✅ Key Specifications & Typical Features

From standard product descriptions of 90D aspheric lenses:

🏥 Purpose & Uses in Clinical Practice

The 90D aspheric lens is widely used by ophthalmologists and optometrists for:

• Retina and fundus examination — evaluating retina, optic disc, macula, and posterior pole.

• General diagnostic screening — diabetic retinopathy screening, macular degeneration detection, optic nerve head assessment, glaucoma evaluations, etc.

• Examination even with small pupils — its optical design allows fundus visualization without requiring full pupil dilation in many cases.

• Efficient slit-lamp funduscopy — non-contact and convenient for routine clinical use, making it a standard lens for many eye clinics.

🧰 Advantages & Why Aspheric 90D is Popular

• Sharp, high-resolution retinal images: Aspheric surfaces reduce spherical and other aberrations, providing clearer, distortion-free views of retinal structures

• Wide field of view + good magnification balance: Offers a compromise between seeing a broad area of the fundus and still getting enough detail — ideal for general fundus screening and diagnostics. \

• Convenience & ergonomics: The lens is often compact, light, and ergonomically designed — easy to handle and integrate with slit-lamp biomicroscopes.

• Versatility: Useful in a variety of clinical situations — routine exams, screenings, even cases with small pupils — making it a “must-have” for ophthalmology practice.

⚠️ Considerations / Limitations

• While 90D is a good general-purpose lens, sometimes other lenses (e.g. higher magnification or wider-field lenses) might be preferred depending on the specific diagnostic need (e.g. detailed macula work, peripheral retina, or very small pupils).

• As with all non-contact slit-lamp lenses, proper cleaning and sterilization (or disinfection) between uses is important — surfaces must be free from dust/particles to avoid artefacts.