Comparison of corneal biomechanics after microincision lenticule extraction and small incision lenticule extraction.

Autor:	Wu Z; Tianjin Key Lab of Ophthalmology and Visual Science, Tianjin Eye Hospital & Eye Institute, Clinical College of Ophthalmology, Tianjin Medical University, Tianjin, China.; Xi'an Children's Hospital, Xi'an, China., Wang Y; Tianjin Key Lab of Ophthalmology and Visual Science, Tianjin Eye Hospital & Eye Institute, Clinical College of Ophthalmology, Tianjin Medical University, Tianjin, China., Zhang J; Tianjin Key Lab of Ophthalmology and Visual Science, Tianjin Eye Hospital & Eye Institute, Clinical College of Ophthalmology, Tianjin Medical University, Tianjin, China., Chan TCY; Department of Ophthalmology and Visual Sciences, The Chinese University of Hong Kong, Kowloon, Hong Kong.; Department of Ophthalmology, Hong Kong Eye Hospital, Kowloon, Hong Kong., Ng ALK; Department of Ophthalmology, The University of Hong Kong, Pokfulam, Hong Kong., Cheng GPM; Hong Kong Laser Eye Center, Hong Kong, Hong Kong., Jhanji V; Department of Ophthalmology and Visual Sciences, The Chinese University of Hong Kong, Kowloon, Hong Kong.; Department of Ophthalmology, Hong Kong Eye Hospital, Kowloon, Hong Kong.; Centre for Eye Research Australia, University of Melbourne, Victoria, Australia.
Jazyk:	angličtina
Zdroj:	The British journal of ophthalmology [Br J Ophthalmol] 2017 May; Vol. 101 (5), pp. 650-654. Date of Electronic Publication: 2016 Aug 19.
DOI:	10.1136/bjophthalmol-2016-308636
Abstrakt:	Objectives: To evaluate and compare the change in corneal biomechanical properties after microincision lenticule extraction (MILE) and small incision lenticule extraction (SMILE). Methods: In this prospective study, 60 eyes received MILE surgery with 2 mm opening incision, while 64 eyes received SMILE procedure with 5 mm opening incision. Corneal hysteresis (CH), corneal resistance factor (CRF) and 37 other biomechanical waveform parameters were quantitatively assessed using ocular response analyser (ORA) preoperatively and up to 6 months postoperatively. All changes were calculated as the difference between preoperative and postoperative values (Δ). Results: Both CH and CRF values decreased significantly after MILE and SMILE (p<0.001). ΔCRF (o=0.028) and ΔCRF index (ΔCRF/preoperative CRF) (p=0.043) were statistically lower for all eyes at 1-week follow-up. ΔCH index (ΔCH/preoperative CH) was statistically lower at 1-week (p=0.043) and 1-month (p=0.015) follow-ups in MILE group when compared with SMILE group. In both MILE and SMILE group, ΔCH index and ΔCRF index were positively correlated with preoperative manifest refraction spherical equivalent, residual stromal thickness (RST) index (RST/preoperative central corneal thickness) and negatively correlated with lenticule thickness (p<0.05). Conclusions: Both MILE and SMILE procedures significantly altered the biomechanical characteristics of cornea. Smaller opening incision was associated with less reduction in ORA parameters during early postoperative period. (Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://www.bmj.com/company/products-services/rights-and-licensing/.)
Databáze:	MEDLINE
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