CIRRUS HD-OCT User Manual 2660021169012 Rev. A 2017-12Patient Preparation 5-11the internal lens into position (you may hear a click while this occurs) and dim theillumination to avoid pupillary constriction by default.The patient’s exam experience with the CIRRUS HD-OCT is normally brief and comfortable.An experienced operator can acquire several scans from each eye in the space of 5–7minutes. An exam usually requires the patient to look inside the imaging aperture for 1–3minutes at a time for each eye, depending on the number of scans desired. The instrumentacquires most scans in 1–5 seconds. The additional time is required to align the patientbefore scanning and to optimize scan quality. The patient may sit back between scans asneeded. Note that the CIRRUS HD-OCT is never to contact the patient’s eye.Selecting a scan type moves the chinrest into the default or saved position for the scan.Wait until the chinrest automatic positioning is complete before instructing the researchsubject to place his or her chin on the chinrest.If you are using a prior scan (see Patient Preparation on page 5-10) on a patient, thepatient must wait until the prior scan has been selected and the chinrest motions arecomplete before placing their head in the chinrest. Reducing the amount of time thepatient spends in the chinrest improves patient comfort.Optional Eyelid ElevationTo get a scan unobstructed by the eyelids, especially for vertical scans, you may find itnecessary to tape the eyelids of either eye or manually elevate the eyelid during scanacquisition in accordance with standard medical practice. For many patients, it is sufficientto ask them to open their eyes wide during scan acquisition. In certain cases however, itmay be necessary to tape the patient’s eyelids in order to get an unobstructed scan.PrecautionsCAUTION: When you complete scan acquisition and before you click the Finish or IDPatient button in the A CQUIRE screen, always prompt the patient to sit back and move thehead away from the chinrest. Clicking either of these buttons in the ACQUIRE screen causesthe chinrest to reposition itself beyond the point where the patient’s face would contactthe lens if the head remained in the chinrest. Failure to observe this warning could result ininjury to the patient.In the A CQUIRE screen, have patient sit back before you click Finish or ID Patient.
