We are about to embark on creating a new Interspire shop.&nbsp; The shop will sell glasses, both prescription and non-prescription. &nbsp;<br/>Our Requirement if for a developer very familiar with Interspire to develop this module.<br/>The shop is one selling prescription glasses. The prescription information (about<br/>6 numeric values) needs to:<br/>• Be recorded/entered by a customer on checkout<br/>• Be recordable for a customer before checkout if they choose<br/>• A permissible range of prescriptions needs to be recorded (in the admin)<br/>for each product e.g. Glasses A are available for prescriptions between +5<br/>and -5<br/>• The user needs to be able to enter their prescription either before (they<br/>would log in) or after adding glasses to their shopping basket.<br/>• If the visitor enters it before checkout, a filter would be applied to the<br/>glasses visible on the website so that only those that are available with<br/>their prescription are shown.<br/>• If the visitor enters it on checkout, the visitor would be advised that the<br/>glasses they have chosen are not available for their prescription and<br/>invited to search again (filter applied) or call for assistance.<br/>• The website would also support non-prescription glasses and other<br/>products.