We will ask 80 patients with Parkinson's disease, representing the full spectrum of motor and cognitive symptoms, to participate. Participation will include measurement of eye movements using two methods: the new computer-based saccade battery and the best available video-based eye-tracking equipment. The evaluation will be repeated about 30 days later. Data will be analyzed to determine whether the computer-based tasks are reliable and able to provide the same quality of information as the gold standard in eye-tracking. A comparison sample of 80 healthy older adults will also complete the behavioral saccade tests in order to establish normative data that will enable application in clinical settings.

This study is enrolling participants who are already implanted with a S-ICD device (Subcutaneous Implantable Cardioverter Defibrillator, which is a device designed to monitor heart rhythms and deliver a shock to the heart to stop life threatening heart rhythms), and are undergoing a routine outpatient clinic follow up appointment to have their S-ICD checked. The aim of the study is to see if a feature in the device can recognize muscle movement and differentiate movement from irregular heart signals. The study involves doing some simple arm exercises while collecting device data, both with this feature turn on and then with it turned off. Participants will be randomized to either have the feature turned on or off initially then it will be programmed the alternative way and the same exercise testing will be repeated. The study will involve just one visit.

The primary purpose of this clinical investigation is to evaluate the SpO2
accuracy of neonatal, infant, and pediatric Philips SpO2 sensors with the Philips
FAST Pulse Oximetry System. Accuracy will be evaluated against the gold
standard, SaO2 obtained from arterial blood samples and assessed by COOximetry.

Additionally, this study will be used to determine if skin pigmentation impacts
SpO2 accuracy and to identify the occurrence of occult hypoxemia, defined as an
SaO2 <88% with an SpO2 ≥92%, with consideration to skin pigmentation.