Biomechanical properties of the cornea in Floppy eyelid syndrome

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Background: Floppy eyelid syndrome (FES) is a frequently underdiagnosed disorder of unknown pathogenesis. FES has been associated with ocular conditions such as keratoconus. At present, despite the frequent combination of FES and keratoconus, there are almost no data on the biomechanical properties of the cornea in these patients. Aims: to determine the cornea’s biomechanical properties in patients with floppy eyelid syndrome. Methods: The study included 40 patients (54 eyes) with hyper-extensible eyelid syndrome. The average age was 53.9±6.7 years. The central corneal thickness averaged 551±25 µm. All the patients underwent a standard ophthalmological examination, including pneumotonometry. The intraocular pressure (IOP) and biomechanical properties of the cornea were measured using dynamic bidirectional applanation. Results: The study of the cornea’s biomechanical properties in patients with floppy eyelid syndrome showed a decrease in the corneal hysteresis (CH) indices to 9.96±0.61 mm Hg on the average, in the corneal resistance factor (CRF) — to 9.54±0.64 mm Hg. Moreover, their value varied depending on the severity of the syndrome. The mean value of the corneal compensated IOP (IOPcc) in the entire sample was 15.5±1.0 mm Hg, Goldman IOP (IOPg) — 15.1±2.0 mm Hg, pneumotonometric IOP — 11.61±2.9 mm Hg. Regardless of the severity, the pneumotonometric IOP indices did not have statistically significant differences, while as this syndrome progressed, the IOPcc and IOPg indices showed a steady decrease in the mean values. Conclusions: It was found that, in floppy eyelid syndrome, the biomechanical parameters of the cornea were reduced. At the same time, the value of these indicators varied significantly with the severity. The largest and the smallest decrease were observed in the corneal hysteresis index and the corneal-compensated IOP, respectively.

About the authors

Ekaterina A. Krinitsyna

Research Institute of Eye Diseases

Author for correspondence.
ORCID iD: 0000-0002-9882-2154
Russian Federation, Moscow

Yaroslav O. Grusha

Research Institute of Eye Diseases

ORCID iD: 0000-0002-6461-8243
SPIN-code: 6595-4029

MD, PhD, Professor

Russian Federation, Moscow


  1. Culbertson WW, Ostler HB. The Floppy eyelid syndrome. Am J Ophthalmol. 1981;92(4):568–575. doi: 10.1016/0002-9394(81)90652-8
  2. Hashemi H, Rastad H, Emamian MH, Fotouhi A. Floppy eyelid syndrome and its determinants in iranian adults: a population-based study. Eye Contact Lens. 2017;43(6):406–410. doi: 10.1097/ICL.0000000000000297
  3. Eiferman RA, Gossman MD, O’Neill K, Douglas CH. Floppy eyelid syndrome in a child. Am J Ophthalmol. 1990;109(3): 356–357. doi: 10.1016/s0002-9394(14)74572-6
  4. Gross RH, Mannis MJ. Floppy eyelid syndrome in a child with chronic unilateral conjunctivitis. Am J Ophthalmol. 1997;124(1):109–110. doi: 10.1016/s0002-9394(14)71654-x
  5. Paciuc M, Mier ME. A woman with the Floppy eyelid syndrome. Am J Ophthalmol. 1982;93(2):255–256. doi: 10.1016/0002-9394(82)90429-9
  6. Rao LG, Bhandary SV, Devi AR, Gangadharan S. Floppy eyelid syndrome in an infant. Indian J Ophthalmol. 2006;54(3):217–218. doi: 10.4103/0301-4738.27090
  7. Ezra DG, Beaconsfield M, Sira F, et al. The associations of Floppy eyelid syndrome: a case control study. Ophthalmology. 2010;117(4):831–838. doi: 10.1038/eye.2009.212
  8. Kadyan A, Asghar J, Dowson L, Sandramouli S. Ocular findings in sleep apnoea patients using continuous positive airway pressure. Eye (Lond). 2010;24(5):843–850. doi: 10.1038/eye.2009.212
  9. Donnenfeld ED, Perry HD, Gibralter RP, et al. Keratoconus associated with Floppy eyelid syndrome. Ophthalmology. 1991;98(11):1674–1678. doi: 10.1016/s0161-6420(91)32070-0
  10. Negris R. Floppy eyelid syndrome associated with keratoconus. J Am Optom Assoc. 1992;63(5):316–319.
  11. Naderan M, Jahanrad A, Farjadnia M. Prevalence of eyelid laxity and its association with ophthalmic findings and disease severity in patients with keratoconus. Eur J Ophthalmol. 2017;27(6): 670–674. doi: 10.5301/ejo.5000937
  12. Pihlblad MS, Schaefer DP. Eyelid laxity, obesity, and obstructive sleep apnea in keratoconus. Cornea. 2013;32(9):1232–1236. doi: 10.1097/ICO.0b013e318281e755
  13. Yeung AM, Ashfaq I, Ghosh YK, et al. Floppy eyelid syndrome: the coventry experience. Orbit. 2014;33(6):399–405. doi: 10.3109/01676830.2014.949785
  14. Goldberg RA, Coden DJ, Hornblass A, Mitchell JP. Floppy eyelid syndrome associated with marked lower eyelid ectropion. Am J Ophthalmol. 1989;108(5):610–612. doi: 10.1016/0002-9394(89)90452-2
  15. Muniesa M, Sanchez-de-la-Torre M, Huerva V, et al. Floppy eyelid syndrome as an indicator of the presence of glaucoma in patients with obstructive sleep apnea. J Glaucoma. 2014;23(1):81–85. doi: 10.1097/IJG.0b013e31829da19f
  16. Huerva V, Muniesa MJ, Ascaso FJ. Floppy eyelid syndrome in obstructive sleep apnea syndrome. Sleep Med. 2014;15(6): 724–725. doi: 10.1016/j.sleep.2013.12.017
  17. Chambe J, Laib S, Hubbard J, et al. Floppy eyelid syndrome is associated with obstructive sleep apnea: a prospective study on 127 patients. J Sleep Res. 2012;21(3):308–315. doi: 10.1111/j.1365-2869.2011.00968.x
  18. Woog JJ. Obstructive sleep apnea and the Floppy eyelid syndrome. Am J Ophthalmol. 1990;110(3):314–315. doi: 10.1016/s0002-9394(14)76357-3
  19. McNab AA. Floppy eyelid syndrome and obstructive sleep apnea. Ophthal Plast Reconstr Surg. 1997;13(2):98–114. doi: 10.1097/00002341-199706000-00005
  20. Ong CW, O’Driscoll DM, Truby H, et al. The reciprocal interaction between obesity and obstructive sleep apnea. Sleep Med Rev. 2013;17(2):123–131. doi: 10.1016/j.smrv.2012.05.002
  21. Franczak A, Bil-Lula I, Sawicki G, et al. Matrix metalloproteinases as possible biomarkers of obstructive sleep apnea severity — a systematic review. Sleep Med Rev. 2019;46:9–16. doi: 10.1016/j.smrv.2019.03.010
  22. Wang S, Li S, Wang B, et al. Matrix metalloproteinase-9 is a predictive factor for systematic hypertension and heart dysfunction in patients with obstructive sleep apnea syndrome. Biomed Res Int. 2018;2018:1569701. doi: 10.1155/2018/1569701
  23. Nadarajah S, Samsudin A, Ramli N, et al. Corneal hysteresis is reduced in obstructive sleep apnea syndrome. Optom Vis Sci. 2017;94(10):981–985. doi: 10.1097/OPX.0000000000001117
  24. Thakur N, Kupani M, Pandey RK, et al. Genetic association of -1562C>T polymorphism in the MMP9 gene with primary glaucoma in a north Indian population. PLoS One. 2018;13(2): e0192636. doi: 10.1186/s12920-020-00855-1
  25. Shetty R, Ghosh A, Lim RR, et al. Elevated expression of matrix metalloproteinase-9 and inflammatory cytokines in keratoconus patients is inhibited by cyclosporine A. Invest Ophthalmol Vis Sci. 2015;56(2):738–750. doi: 10.1167/iovs.14-14831
  26. Johnson RD, Nguyen MT, Lee N, Hamilton DR. Corneal biomechanical properties in normal, forme fruste keratoconus, and manifest keratoconus after statistical correction for potentially confounding factors. Cornea. 2011;30(5):516–523. doi: 10.1097/ICO.0b013e3181f0579e
  27. Аветисов С.Э., Новиков И.А., Патеюк Л.С. Кератоконус: этиологические факторы и сопутствующие проявления // Вестник офтальмологии. 2014. № 4. C. 110–116. [Avetisov SE, Novikov IA, Pateyuk LS. Keratoconus: etiological factors and concomitant manifestations. Bulletin Ophthalmol. 2014;(4): 110–116. (In Russ).]
  28. Muniesa Royo MM, March de Ribot A, Sanchez-de-la-Torre M, et al. Corneal biomechanical properties in Floppy eyelid syndrome. Cornea. 2015;34(5):521–524. doi: 10.1097/ICO.0000000000000396
  29. Culbertson WW, Tseng SC. Corneal disorders in Floppy eyelid syndrome. Cornea. 1994;13(1):33–42. doi: 10.1097/00003226-199401000-00007

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Copyright (c) 2022 Krinitsyna E.A., Grusha Y.O.

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