Figure 5. Analysis of tear film profile bilaterality in four control individuals. A: Virtual gel view of tear profiles obtained from volunteers CT1, CT3, CT4 and CT6 from left (LE) and right eye (RE). B: PCA analysis of the same tear profiles. An association and spatial proximity of left and right tear samples from the same individual is observed indicating similar profiles. A spatial separation of individuals CT1, CT3, CT4, and CT6 is also observed suggesting inter-individual variability.