1. Introduction  

2. Periocular in COVID-19 Pandemic  

3. Anatomical Cues in the Periocular Region  

4. Methodologies Used for Periocular Recognition  

5. Periocular Recognition in Different Spectra  

6. Periocular Fusion with Other Modalities  

7. Periocular Recognition on Mobile Devices  

8. Specific Applications  

9. Datasets and Competitions  

10. Challenges and Future Directions  

11. Summary  