Ron Rabbetts explains the implications for back vertex power adjustments outlined in a new British Standard for spectacle lens tolerance
This article is best viewed in a PDF Format.
The table above shows an excerpt from BS EN ISO 21987 on the tolerances for back vertex power of single-vision and multifocal lenses
Register now to continue reading
Thank you for visiting Optician Online. Register now to access up to 10 news and opinion articles a month.
Register
Already have an account? Sign in here