Plano Concave Lens For Vision Correction

A plano concave lens is a simple lens type with one flat (plano) surface and one concave (inwardly curving) surface. The concave surface causes the lens to diverge and spread light rather than converge and focus. This gives the lenses a negative focal length and lens power, measured in negative diopters. Their low aberrations, thinness, durability, and low cost are also advantageous for many optical systems.

 

We offer high precision and plano concave lenses for any application requiring controlled divergence of light. Our lenses deliver exceptional performance through ideal design and world-class manufacturing techniques. They are carefully crafted to provide the same negative dioptric power specified, diffusing and diverging light precisely as needed for your optical system. Stringent quality standards minimize aberrations, ensuring evenly spread, distortion-free beams. We also offer custom-designed lenses tailored to your exact requirements. Anti-reflection coatings are available for maximum transmission efficiency. Please contact us today to discuss your custom requirements - we make the optical components that make your system work!

 

Features

- Precise concave curvature

- Minimized aberrations

- Ultrathin center thickness

- Robust and durable

- Precision optics

 

Parameters

Product name	Plano Concave Lens
Diameter tolerance	+/- 0.05mm
Center thickness tolerance	+/- 0.02mm
Focal length tolerance	+/- 2%
Surface quality	60/40 or better
Material	BK7 or custom
Clear aperture	>90%
Centering	<3 arc min

 

Spectrum reflectance curve

 

Applications

The significant applications of plano concave lenses utilize their strong negative power and ability to rapidly expand light and create virtual images located behind the lens. They are ideal for vision correction, producing last beam divergence, virtual minification, balancing positive lenses, and adjusting collimated beams. Their high power but simple single-surface design leads to lightweight, low-cost optics functional across many areas of science and technology.

- Vision correction

- Beam divergence

- Virtual minification

- Negative lens balancing

- Image projection

- Collimated light adjustment

 

What is a plano concave used to correct?

Plano concave lenses are typically used to correct hyperopia (farsightedness) and presbyopia (age-related difficulty focusing on near objects).

 

In hyperopic eyes, the eyeball is too short, causing light rays to focus behind the retina instead of on it. A diverging lens like the plano-concave lens compensates by shifting the focus onto the retina. The negative lens power causes the light to diverge slightly before reaching the eye, allowing proper focusing.

 

For presbyopia, as the eye ages, the lens stiffens and has more difficulty changing shape to shift focus from distant to near objects. The reduced ability to accommodate means close-up tasks become blurry. A plano-concave lens provides some diverging power to reduce the focal length and make close things appear more clearly focused without significantly affecting distance vision.

 

Some key ways plano concave lenses correct hyperopia and presbyopia:

 

• Reduces the eye's refractive power. The negative lens diopters counteract some of the eye's focusing ability by diverging light entering the eye. This reduces the eye's effective refractive state.

 

• Increases the focal length. By causing slight divergence of the light, the lens increases the distance over which the light remains close to focused. This means the range of clear spaces is increased, improving close-range focusing ability.

 

• Magnifies the image. The virtual image formed by the diverging lens causes objects to appear slightly larger in size, making them easier to see, especially for presbyopic eyes. The image remains upright but seems further away.

 

• Relieves eyestrain. The lens's less strenuous focusing and more evident close-range vision help prevent eyestrain, tired eyes, and headaches that would otherwise result from constant over-focusing.

 

• Simple, inexpensive solution. Plano-concave lenses are relatively simple corrective lenses that can provide benefits at lower cost and with fewer optical complications compared to multifocal or progressive lens designs. They may be adequate for mild to moderate focusing issues.

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