We use cookies, small text files that are downloaded to your end devices, in order to make your interaction with our websites as informative, relevant and user-friendly as possible. We divide cookies into three categories: "essential cookies," necessary for the operation of the website, and "functional" and "marketing cookies" that help us to improve the website and the user experience.
By clicking on "accept all" you are agreeing to use all cookies. In order to only allow certain cookies, please click on "customize settings".
Klaviyo is a Customer CRM and Email Marketing Platform that allows Hilco Vision to collect sales and customer data in order to serve relevant marketing material and transactional communication.
Default functionality of a website that has login sessions. It associates a user's browser with their login session on the server so that the server knows which user they are.
The XSRF_TOKEN or cross-site request forgery token is used to create secure user experience and prevent malicious exploits of web connections.
AWS Cloudfront is a fast delivery network which allows the images to quickly be displayed.
Rollbar is a service that allows website developers to identify and monitor for errors that may occur on a variety of web platforms.
Google Tag Manager is a tag management system (TMS) that allows you to quickly and easily update measurement codes and related code fragments collectively known as tags on your website or mobile app. Once the small segment of Tag Manager code has been added to your project, you can safely and easily deploy analytics and measurement tag configurations from a web-based user interface.
Google Analytics is Google’s analytics tool that helps website and app owners to understand how their visitors engage with their properties. It may use a set of cookies to collect information and report site usage statistics without personally identifying individual visitors to Google. The main cookie used by Google Analytics is the ‘_ga’ cookie. In addition to reporting site usage statistics, data collected on Google properties by Google Analytics may also be used, together with some of the advertising cookies described above, to help show more relevant ads on Google properties (like Google Search) and across the web and to measure interactions with the ads we show.
The Single Symbol Book is designed for testing children and adults who have difficulties perceiving symbols in lines.
The visual acuity values measured with single symbols are often several lines better than the line acuity values in persons with impaired vision and thus overestimate the quality of visual functioning.
This book features single optotype line sizes from 20/200 to 20/8 (6/60 to 6/2.4) equivalent, 0.10 to 2.50. Includes isolating mask, response key, instructions, and 13 offset pages for easy flipping.
Dimensions: Width 5.75" x Height 5.44" (14.61 cm x 13.82 cm).
EN
French
