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    Figure 1. Normal non-invasive tear breakup. All points on the ocular surface are stable until a blink that occurs at 30 seconds. Image courtesy S. Barry Eiden, OD, FAAO
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    Figure 2. Abnormal non-invasive tear breakup. Over 50 percent area breakup with steep slope of the break-up time curve, first break up at 0.5 seconds, and average breakup at 4.2 seconds. Image courtesy S. Barry Eiden, OD, FAAO
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    Figure 3. Normal inferior tear meniscus height (0.25mm). This measurement was taken with visible light illumination for demonstration purposes. Typically infrared illumination is used. Image courtesy S. Barry Eiden, OD, FAAO
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    Figure 4. Normal lipid layer as evidenced by significant coloration of the bifringence pattern on the Placido rings. Image courtesy S. Barry Eiden, OD, FAAO
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    Figure 5. Thin lipid layer as evidenced by lack of coloration of the bifringence pattern on the Placido rings. Image courtesy S. Barry Eiden, OD, FAAO
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    Figure 6. Normal superior and inferior meibomian glands as imaged with Meibo-Scan meibography with Oculus Keratograph 5. Image courtesy S. Barry Eiden, OD, FAAO
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    Figure 7. Meibomian gland dropout in the superior and inferior tarsus of a 66-year- old patient with mixed anterior and posterior blepharitis and dry eye. Image shows basic and enhanced infrared images. Image courtesy Oculus
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    Figure 8. Tear Science LipiView II provides evaluation of lipid layer, blink analysis, and high resolution dynamic meibomian imaging (DMI) meibography. Image courtesy TearScience
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    Figure 9.DMI meibography from LipiView II. Top: Normal meibomian glands; bottom: advanced meibomian gland atrophy. Image courtesy TearScience
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    Figure 10. TearLab osmolarity readings in which the greater of the two eyes is over 308 mOsm/L, and the asymmetry is greater than 10 mOsm/L, indicating the presence of dry eye disease. Image courtesy TearLab
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    Figure 11. Rapid Pathogen Screening (RPS) InflammaDry for detection of MMP-9s in the tear film. Image on right is positive for elevated MMP-9 (> 40 ng/ml). Image on left is negative for elevated MMP-9 (< 40 ng/ml). Image courtesy RPS