Contralateral eye comparison of the phacoemulsification metrics, patient experience and clinical outcomes in patients undergoing bilateral cataract surgery with two commonly used femtosecond laser systems

Figures & data

Table 1 Demographic data

Demographic characteristics	Mean ± SD	n	%
Age, years	69.9 ± 8.61	50	100
Gender
Female		31	62
Male		19	38
Race
African American		3	6
Caucasian		47	94
Laterality
Right eyes		29	58
Left eyes		21	42
First surgical eye
Catalys		42	84
LenSx		8	16
Second surgical eye
Catalys		8	16
LenSx		42	84

Table 2 Laser system measurements (mean ± SD)

System group	Catalys	LenSx	p-value
Patient interface preparation time (seconds)	140.6 ± 36.13	148.7 ± 52.14	0.346
Number of docking attempts	1.3 ± 0.45	1.4 ± 0.61	0.132
Total suction time (seconds)	123.2 ± 24.82	108.5 ± 34.93	0.005

Figure 1 Incidence of subconjunctival hemorrhage in Catalys and LenSx groups.

Figure 2 The patient’s perception of pressure after femtosecond laser fragmentation in Catalys and LenSx groups.

Figure 3 Patient’s experience with vision loss after femtosecond laser fragmentation in Catalys and LenSx groups.

Figure 4 Completeness of capsulotomy in Catalys and LenSx groups.

Table 3 Cataract density

System group	Grade 1	Grade 2	Grade 3	Grade 4
Catalys	6%	50%	42%	2%
LenSx	10%	58%	32%	0%

Table 4 Phacometric measurements (mean ± SD)

System group	Catalys	LenSx	p-value
Total ultrasound time (seconds)	50.6 ± 35.94	50 ± 41.09	0.885
Average phaco power (%)	6.2 ± 3.98	6.4 ± 3.13	0.675
Nucleus removal time (seconds)	208.8 ± 143.31	223.1 ± 132.27	0.256
Cortical removal time (seconds)	86.3 ± 36.72	106.7 ± 70.9	0.01
Effective phaco time (seconds)	21.4 ± 23.27	21 ± 26.19	0.896

Figure 5 Surgeon’s evaluation of the ease of cortex removal during surgery in Catalys and LenSx groups.

Table 5 Preoperative and postoperative (last follow-up) clinical outcomes (mean ± SD)

Parameter	Time point	Catalys	LenSx	p-value
UDVA	Preoperative	0.68 ± 0.32	0.62 ± 0.30	0.046
	Postoperative	0.16 ± 0.21	0.10 ± 0.12	0.063
CDVA	Preoperative	0.28 ± 0.21	0.24 ± 0.17	0.232
	Postoperative	0.03 ± 0.06	0.03 ± 0.05	0.687
MRSE (D)	Preoperative	−0.09 ± 3.45	0.03 ± 3.16	0.417
	Postoperative	−0.16 ± 0.71	−0.03 ± 0.29	0.181
Flat K (D)	Preoperative	43.1 ± 1.62	43.2 ± 1.48	0.498
	Postoperative	43.1 ± 1.60	43.1 ± 1.42	0.499
Steep K (D)	Preoperative	44 ± 1.62	44 ± 1.42	0.86
	Postoperative	44.1 ± 2.2	43.8 ± 1.44	0.336
Pupil size (mm)	Preoperative	5.02 ± 1.24	5.02 ± 1.36	1
	Postoperative	4.95 ± 1.21	4.99 ± 1.31	0.438
Corneal thickness (μm)	Preoperative	540.0 ± 35.55	539.8 ± 34.85	0.887
	Postoperative	540.6 ± 35.17	540.6 ± 33.11	0.977
Axial length (mm)	Preoperative	23.98 ± 1.42	23.98 ± 1.33	0.986
	Postoperative	23.86 ± 1.36	23.93 ± 1.31	0.156
IOP (mmHg)	Preoperative	14.8 ± 2.92	14.8 ± 3.08	0.888
	Postoperative	13.7 ± 2.48	13.6 ± 2.21	0.574
ECD (cells/mm^2)	Preoperative	2,705.9 ± 286.11	2,727.8 ± 268.17	0.396
	Postoperative	2,689.4 ± 266.5	2,711.1 ± 257.88	0.358

Abbreviations: UDVA, uncorrected distance visual acuity; CDVA, corrected distance visual acuity; MRSE, manifest refraction spherical equivalent; K, keratometry; IOP, intraocular pressure; ECD, endothelial cell density.