Determine the amount of prism for an OD lens from the diagram of a lensmeter reticle below.

Determine the amount of prism for an OS lens from the diagram of a lensmeter reticle below.

What instrument is used for obtaining measurements pertaining to a contact lens fitting? 

What is the thickness of the lens shown?

Why is a lensmeter an important tool for any optician? 

In this transverse image, what branch is #2 pointing to? (Use the standard medical abbreviation or full name spelled correctly) 

During a follow-up ultrasound for a patient with an abdominal aortic stent-graft (EVAR), what is the most critical measurement the sonographer must document to evaluate graft success and assess for potential endoleaks? 

What are B-lines in lung sonography, and what clinical pathology do they indicate when multiple B-lines are present in a single rib space?

In this transverse epigastric view, what anatomical structure does the letter ‘A’ (red box/arrow) represent? 

Histologically, blood vessel walls consist of three layers. What is the composition and function of the tunica intima?