Provide a valuable resource to your clients or customers by linking to this resource page. Just place the following link on your website.
A hand stone is a small abrasive block used in optical labs to manually smooth, bevel, or deburr lens edges. Technicians use it after edging or drilling to remove sharpness and improve fit. The tool comes in various grits for different materials, from glass to plastic. Though simple, it provides control that machines cannot always match. Proper technique avoids chipping or warping delicate lenses.
read more about hstone in optics ...After edging, the operator holds the lens at a slight angle against the stone while rotating it evenly. Light pressure rounds the edge for safety and comfort in frames. For drilled or grooved lenses, the hand stone refines holes and prevents stress cracks. Water lubrication reduces heat buildup. Consistent motion yields a clean, even bevel.
A hand stone features a rotating abrasive wheel made from aluminum oxide or silicon carbide. Its fine grit texture allows controlled removal of lens material. The tool's housing includes coolant channels to manage friction heat. Variable speed motors let operators adjust performance for different lens types.
A hand stone is used to manually smooth and edge lenses during fabrication. It contributes to the final fit and finish of eyeglasses, providing comfort and visual accuracy.
Every tool, measurement, and test in eye care contributes to maintaining accurate vision and eye health. Whether used to diagnose conditions, guide prescriptions, or fine-tune lens performance, these elements help eye care professionals provide clear, reliable results and give every patient precise, comfortable vision.
Hand stones come in different materials and grit levels, and each behaves a little differently on a lens edge. Finer stones help smooth small tool marks after edging, while coarser stones remove sharp spots faster. In most labs, the choice comes down to the lens material, the finish you want, and how much you need to take off.
Keep the stone clean so debris does not scratch the lens surface or leave new marks on the edge. Use light pressure and short passes, then check the edge often so you do not overwork one area. Wear eye protection, and keep fingers clear of sharp edges, especially on glass lenses.
Common types include silicon carbide for plastics, aluminum oxide for glass, and diamond stones for precision tasks. Some feature dual grit surfaces, one coarse for shaping, one fine for polishing. Flexible foam-backed stones adapt to curves. Proper grit selection determines finish quality. Keeping stones clean maintains efficiency.
Even with automated edgers, finishing by hand corrects small imperfections and custom fits lenses to unique frames. A skilled technician can feel friction changes that signal proper contact. The tool's simplicity makes it reliable and portable. It bridges craftsmanship and precision machinery. Manual finishing often defines the final polish of quality eyewear.
Rinse regularly to remove debris and restore cutting power. Avoid oil contamination that clogs pores. Store dry to prevent bacterial growth or breakdown. Flatten warped surfaces on sandpaper or concrete. A well-kept stone lasts for years of dependable use.
No, it's denser and reusable.
“Setting Up Your New In Office Lab.” Review of Optometry. Jobson Medical Information. https://www.reviewofoptometry.com/article/setting-up-your-new-in-office-lab. Published October 15, 2012
“Glaucoma Patients. p. 85.” Review of Optometry. Jobson Medical Information. https://www.reviewofoptometry.com/CMSDocuments/2012/10/ro1012i.pdf. Published October 15, 2012
“Laramy K OpticianWorks Qualification Standard and Staff Training Program V1.0.2020.” OpticianWorks. https://opticianworks.com/wp-content/uploads/2020/12/OQS-v1.0.2020.pdf. Published 2020
“Essentials of Ophthalmic Lens Finishing.” Elsevier. https://shop.elsevier.com/books/essentials-of-ophthalmic-lens-finishing/smith/978-0-7506-7137-2. Published July 8, 2003
“Optical Laboratory. Equipment and finishing workflow overview.” Review of Optometry. Jobson Medical Information. https://www.reviewofoptometry.com. Published 2012