2.5x TTL are our entry level TTL loupes. It is the easiest to get used to. We recommend 2.5x for general dentists, dental students and hygienists. Weighing less than 1.0 ounces, 2.5 x TTL is the lightest loupes on the market. It offers a wider field of view than flip up loupes and generous depth of field with sufficient magnifying power for regular dental, medical and surgical procedure.
If you needs RX insert lens, cost is for single vision and 9 for progressive. Please fax your prescription to 831-597-5018 and write down your amazon order number on the fax