Spherical lenses have at least one surface with a constant radius of curvature. There are two categories of spherical lenses: Convex (Converging) and Concave (Diverging).

Converging (Positive) Lenses
Converging (Positive) Lenses
diverging lenses
Diverging (Negative) Lenses


Optical Glass • Fused Silica • Filter Glass • Float Glass


4mm – 150mm


Dimensional Tolerances Commercial Precision Max Capability
Diameter (mm) +/- 0.10 +/- 0.025 +/- 0.015*
Center Thickness (mm) +/- 0.10 to 0.20 +/- 0.10 to 0.05 +/- 0.025
Surface Tolerances Commercial Precision Max Capability
Surface Quality (scratch-dig) 80 – 50 to 60 - 40 40 - 20 20 - 10 to 10 – 5
Surface Roughness (ARMS) > 50 20 < 10
Surface Irregularity (Fringes, P-V @ 633nm) >2 1/2 to 1 1/5
Surface Power (Fringes, P-V @ 633nm) 10 3 to 5 1
Centration (Ray deviation) 5+ min. 2 – 3 min. 10 sec.
* material and size dependent

The manufacturing process of spherical lenses begins with a quote created by a Manufacturing Engineer. The Manufacturing Engineer then designs and orders a near net shape optical glass blank. The optical glass blanks are then delivered to the production line. Once an order starts being processed, the first step is to have diamond ring tools generate the radius into the glass blank. A series of progressively smaller grit diamond wheels or loose abrasive material is then used to finely grind the lens blank. Finally, the polishing process uses pitch or polyurethane pads and a cerium oxide slurry to finish the spherical surface. The finished optical lenses are then either shipped to the customer or retained in the facilities for further treatment with processes such as custom coatings and truncations.

At LaCroix Precision Optics, our vast inventory of conventional and CNC production equipment allows the freedom to manufacture your lens designs in the most efficient and cost-effective manner.

Our other capabilities include:

  • Precision centering
  • Custom truncations
  • Off-axis spherical lenses


We have extensive in-house coating capabilities to meet your requirements. See our coating capabilities.

Uses for Optical Lenses
Surgical loupes Microscopy Multi-spectral imaging
Telescopes LASIK devices Machine vision
Ophthalmology Threat detection Laser target designators