Transitional conic toric intraocular lens for the management of corneal astigmatism in cataract surgery

Figures & data

Figure 1 Cylinder vector analysis.

Notes: (A) TIA vector. (B) EV. (C) NEV. (D) TEV.
Abbreviations: TIA, target-induced astigmatism; EV, error vector; NEV, normalized error vector; TEV, treatment error vector; D, diopters; SIA, surgically induced astigmatism.

Table 1 Demographic data

Demographic data
Age (years)	59.16 ± 12.35 (42–87)
Follow-up (months)	11.61 ± 7.65 (2.5–28)
Axial length (mm)	23.29 ± 1.53 (20.23–27.60)
Anterior chamber depth (mm)	3.12 ± 0.49 (2.06–4.10)
UDVA (LogMar)	0.32 ± 0.30 (0–1)
CDVA (LogMar)	0.14 ± 0.18 (0–0.7)
SE (D)	−0.01 ± 3.24 (−8.75 to 6.38)
Cylinder (D)	−1.92 ± 1.04 (−6.79 to −0.68)

Note: Results are displayed as mean ± SD (range).

Abbreviations: UDVA, uncorrected distance visual acuity; CDVA, corrected distance visual acuity; SE, spherical equivalent; D, diopters; SD, standard deviation.

Figure 2 Three months postoperative cumulative UNVA/UDVA and CDVA.

Notes: (A) Preoperative CDVA and postoperative UDVA and CDVA for group 1 (emmetropia). (B) Preoperative CDVA and postoperative UNVA and CDVA for group 2 (mild myopia for monovision). (C) Difference between UDVA and CDVA for group 1 (emmetropia). (D) Change in CDVA for all 97 eyes.
Abbreviations: UNVA, uncorrected near visual acuity; UDVA, uncorrected distance visual acuity; CDVA, corrected distance visual acuity.

Figure 3 Accuracy of refractive correction.

Notes: (A) Attempted versus achieved SEQ: group 1. (B) Attempted versus achieved SEQ refraction: group 2. (C) SEQ accuracy (all patients). (D) Pre- versus postoperative astigmatism. (E) TIA versus SIA. (F) Refractive astigmatism AE. The blue lines show attempted correction = achieved correction; the green lines show +0.5 and −0.5 from attempted correction; the pink lines show +1 and −1 from attempted correction; the black lines correspond to the linear regression analysis; the linear regression equations are on the gray boxes in the graphs.
Abbreviations: SEQ, spherical equivalent; TIA, target-induced astigmatism; SIA, surgically induced astigmatism; AE, angle of error; D, diopters.

Figure 4 Refractive stability of SEQ.

Notes: (A) Refractive stability of SEQ for emmetropia target (group 1). (B) Refractive stability of SEQ for mild myopia target (group 2).
Abbreviations: SEQ, spherical equivalent; SD, standard deviation; D, diopters.

Table 2 Pre- versus 3-month postoperative data for group 1

	Preoperative	3 months post-surgery	p-value
Emmetropia (group 1)
UDVA (LogMar)	0.41 ± 0.48	0.12 ± 0.12	0.88
CDVA (LogMar)	0.13 ± 0.17	0.026 ± 0.06	<0.0001
Cylinder (D)	−1.98 ± 1.11 (−6.79 to −0.93)	−0.66 ± 0.54 (−2.25 to 0)	<0.0001
SE (D)	−0.57 ± 3.43 (−8.75 to +6.38)	−0.15 ± 0.43 (−1.5 to +0.75)	0.35

Note: Results are displayed as mean ± SD (range).

Abbreviations: UDVA, uncorrected distance visual acuity; CDVA, corrected distance visual acuity; D, diopters; SE, standard error; SD, standard deviation.

Table 3 Pre- versus 3-month postoperative data for group 2

	Preoperative	3 months post-surgery	p-value
Mild myopia (group 2)
UNVA (LogMar)	–	0.16	–
UDVA (LogMar)	0.13 ± 0.19 (0–0.7)	0.34 ± 0.25 (0–1)	0.0003
CDVA (LogMar)	0.17 ± 0.20 (0–0.7)	0.07 ± 0.15 (0–0.7)	0.02
Cylinder (D)	−1.84 ± 0.88 (−3.79 to −0.68)	−0.79 ± 0.63 (−1.88 to 0)	<0.0001
SE (D)	1.07 ± 3.20 (−6.5 to +6.38)	−0.87 ± 0.48 (−2.5 to 0)	0.0032

Note: Results are displayed as mean ± SD (range).

Abbreviations: UNVA, uncorrected near visual acuity; UDVA, uncorrected distance visual acuity; CDVA, corrected distance visual acuity; D, diopters; SE, standard error; SD, standard deviation.

Table 4 Cylinder vector analysis

	Average
TIA vector	1.93 ± 1.04
SIA vector	2.06 ± 1.21
Error of magnitude	0.13 ± 0.64
Arithmetic error of axis	5.18 ± 14.00
Absolute error of axis	9.36 ± 11.60
Axis shift	−30.71 ± 27.67
Error ratio	0.37 ± 0.18
Correction ratio	1.07 ± 0.31
IS	0.37 ± 0.36

Note: Results are displayed as mean ± SD.

Abbreviations: TIA, target-induced astigmatism; SIA, surgically induced astigmatism; IS, index of success.