AIM: The most popular technique for deep anterior lamellar keratoplasty (DALK) is the 'big bubble' (BB) technique wherein air is injected in the cornea to create a bubble that separates Descemet's membrane (DM) from the stroma. An attempt to create a BB often results in the cornea being filled with numerous small bubbles without the formation of a BB. Manual dissection is then required to complete the procedure. The aim of the study is to compare these two groups, successful BB versus failed bubble (FB) dissection to determine whether the clinical outcomes were different. METHODS: In this retrospective comparative study, 46 patients out of 52 who underwent DALK for various corneal stromal diseases such as keratoconus, stromal dystrophy or corneal scarring (caused by different conditions) were included in the analysis. BB was achieved in 25 patients and in the remaining 21 patients a BB separation of the DM was not possible necessitating manual lamellar dissection of stroma to get as close to the DM as possible. RESULTS: The authors compared best-corrected visual acuity, contrast sensitivity, astigmatism, interface densitometry and Scheimpflug pachymetry in the two groups. Postoperative corneal thickness was higher in the 'small bubbles' group (mean 628.9 vs 564.1 μm; p<0.0005), but there was no significant difference in best-corrected visual acuity, astigmatism, contrast sensitivity and densitometry between the groups. CONCLUSIONS: In DALK, manual lamellar dissection is a reasonable alternative when BB separation of the DM is not achieved.
AIM: The most popular technique for deep anterior lamellar keratoplasty (DALK) is the 'big bubble' (BB) technique wherein air is injected in the cornea to create a bubble that separates Descemet's membrane (DM) from the stroma. An attempt to create a BB often results in the cornea being filled with numerous small bubbles without the formation of a BB. Manual dissection is then required to complete the procedure. The aim of the study is to compare these two groups, successful BB versus failed bubble (FB) dissection to determine whether the clinical outcomes were different. METHODS: In this retrospective comparative study, 46 patients out of 52 who underwent DALK for various corneal stromal diseases such as keratoconus, stromal dystrophy or corneal scarring (caused by different conditions) were included in the analysis. BB was achieved in 25 patients and in the remaining 21 patients a BB separation of the DM was not possible necessitating manual lamellar dissection of stroma to get as close to the DM as possible. RESULTS: The authors compared best-corrected visual acuity, contrast sensitivity, astigmatism, interface densitometry and Scheimpflug pachymetry in the two groups. Postoperative corneal thickness was higher in the 'small bubbles' group (mean 628.9 vs 564.1 μm; p<0.0005), but there was no significant difference in best-corrected visual acuity, astigmatism, contrast sensitivity and densitometry between the groups. CONCLUSIONS: In DALK, manual lamellar dissection is a reasonable alternative when BB separation of the DM is not achieved.
Authors: F Poyales; N Garzón; J Mendicute; I Illarramendi; P Caro; O Jáñez; F Argüeso; A López Journal: Eye (Lond) Date: 2017-06-16 Impact factor: 3.775
Authors: Kristin E Hirabayashi; Winston Chamberlain; Jennifer Rose-Nussbaumer; Ariana Austin; Laurel Stell; Charles C Lin Journal: Cornea Date: 2020-06 Impact factor: 2.651
Authors: Nuria Garzón; Francisco Poyales; Igor Illarramendi; Javier Mendicute; Óscar Jáñez; Pedro Caro; Alfredo López; Francisco Argüeso Journal: Int Ophthalmol Date: 2016-11-11 Impact factor: 2.031
Authors: Brenton Keller; Mark Draelos; Kevin Zhou; Ruobing Qian; Anthony Kuo; George Konidaris; Kris Hauser; Joseph Izatt Journal: IEEE Trans Robot Date: 2020-04-16 Impact factor: 6.835
Authors: Neel D Pasricha; Christine Shieh; Oscar M Carrasco-Zevallos; Brenton Keller; David Cunefare; Jodhbir S Mehta; Sina Farsiu; Joseph A Izatt; Cynthia A Toth; Anthony N Kuo Journal: Cornea Date: 2016-11 Impact factor: 2.651