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Privacy policy
The hosting provider processes connection data to deliver the site. If you allow optional statistics, the site stores daily totals by page, action, broad country group and source category. The event database stores no account, IP address or optical inputs. You can change your choice below. The preference is stored only in this browser. Each time we record an event, we delete totals outside the most recent 90 calendar days (UTC). If no events are recorded for a while, deletion resumes with the next event.
Cloudflare hosts this site and routes messages sent to the editorial address. Hosting requires connection data, including your IP address, to deliver pages securely. Choosing Decline leaves all articles and calculators available. Changing your preference applies to future visits in this browser. We honor Global Privacy Control and Do Not Track.
The source category describes how a visit began, such as search or a link from this site. We record a country group rather than a precise location. Your calculations run in this browser. If you email us, we use your email address and the contents of your message to handle your request. Use the editorial address above for privacy questions, access requests or corrections. Where applicable, you may also contact your data protection authority.
With your permission, we also count clicks on the free sample, checkout and engineering inquiry links. These counts do not identify a person or confirm a download, order, payment or message. They contain no email addresses, order details or optical inputs.
Terms of service
The public calculators are available for individual engineering calculations. Each tool states its assumptions and units. Check the input data and validate any outputs you use to make design decisions.
A toolkit purchase licenses one individual or one named user, including a named user working for a company. That user may use and modify the scripts for their own internal optical engineering work. They may share resulting reports, charts and CSV output with clients. The source toolkit and modified copies may not be redistributed or resold. Applicable statutory rights are preserved.
Order support and refunds
Sales have not opened, so there are no toolkit orders or charges at this stage.
For a missing download or a refund request after you place an order, email the editorial team with your order number and a brief description. Creem handles the payment and processes applicable refunds. Your statutory rights under applicable law remain available.
Report a correction or a rights concern
Include the page URL, the specific text or image and the reason for the request. For a rights claim, identify the original work and a way for the editor to reply.