What is the Abbe value of Lenses ?
To get optometry vacancy update join Channel below
RRB OPTOMETRIST Exam preparation
🔷 Ophthalmogy and Optometry MCQ Quizz series
🔷 Free Attend online Optometry quiz test
🔷 Join Optometry course for exam govt exam preparation
What is the Abbe value of Lenses ?
The Abbe value is a numerical value that measures the dispersion of a transparent material.
In spectacles, the Abbe value is important for selecting lenses that minimize chromatic aberration and color distortion.
- Low Abbe value (30-40): Suitable for low-power prescriptions (±2.00 diopters or less). These lenses may exhibit noticeable chromatic aberration.
- Medium Abbe value (40-50): Suitable for medium-power prescriptions (±2.00 to ±4.00 diopters). These lenses offer a balance between optical quality and cost.
- High Abbe value (50-60): Suitable for high-power prescriptions (±4.00 diopters or more). These lenses provide excellent optical quality, minimizing chromatic aberration.
Spectacle lenses with higher Abbe values are:
- Thinner and lighter
- More expensive
- Better suited for high-power prescriptions
- More resistant to chromatic aberration
Common Abbe values for spectacle lenses include:
- CR-39 plastic: 58
- Polycarbonate: 30-40
- High-index plastic (1.67): 23-30
- High-index plastic (1.74): 33-40
Abbe value is just one factor to consider when selecting spectacle lenses. Other factors like refractive index, aspheric design, and coatings also impact optical performance.