Studies

STUDIES

1995 Study	1997 Study	1998 Study	1999 Study	2000 Study	2001 Study

2002 Study	2003 Study	2004 Study	2005 Study	2006 Study	2007 Study

The 1995 European Cataract Outcome Study

Study month: November 1995.

Follow-up: 6 months

Number of participants: 20 surgeons/units.

Number of participating countries: 11.

Total number of surgeries reported: 1589

Number of cases with complete

follow-up data: 1403

Demographic data:

Percentage women 65.6%

Mean age 74.1 years

Second eye surgery 26.1%

Ocular co-morbidity in surgery eye 40.8%

Outcome data:

Induced astigmatism (subtraction method)

average: 0,75 D.

Difference planned-final refraction

average: 0.79 D.

Post-operative visual acuity > = 0.5 in % 86%.

Study 95

The 1997 European Cataract Outcome Study

Study month: March 1997.

Follow-up: 6 months.

Number of participants: 24 surgeons/units.

Number of participating countries: 11.

Total number of surgeries reported: 1684

Number of cases with complete

follow-up data: 1479

Demographic data:

Percentage women 64.5%

Mean age 74.2 years

Second eye surgery 33.1%

Ocular co-morbidity in surgery eye 37.5%

Outcome data:

Induced astigmatism (subtraction method)

average: 0,66 D.

Difference planned-final refraction

average: 0.76 D.

Post-operative visual acuity > = 0.5 in % 84%.

The 1998 European Cataract Outcome Study

Study month: October 1998.

Follow-up: 6 months.

Number of participants: 30 surgeons/units.

Number of participating countries: 12.

Total number of surgeries reported: 2801

Number of cases with complete

follow-up data: 2221

Demographic data:

Percentage women 65.6%

Mean age 73.7 years

Second eye surgery 41.8%

Ocular co-morbidity in surgery eye 36.7%

Outcome data:

Induced astigmatism average:

Methods for calculation:

- subtraction method 0.60 D.

- Naeser polar value 0.77 D.

- Algebraic method 0.94 D.

Difference planned-final refraction

average: 0.69 D.

Post-operative visual acuity > = 0.5 in % 86%.

Study 98

The 1999 European Cataract Outcome Study

Study month: October 1999.

Follow-up: 6 months.

Number of participants: 41 surgeons/units.

Number of participating countries: 15.

Total number of surgeries reported: 3245

Number of cases with complete

follow-up data: 3086

Demographic data:

Percentage women 65.3%

Mean age 73.7 years

Second eye surgery 40.5%

Ocular co-morbidity in surgery eye 40.0%

Outcome data:

Induced astigmatism average:

Methods for calculation:

- subtraction method 0.59 D.

- Naeser polar value 0.73 D.- Algebraic method 0.90 D.

Difference planned-final refraction

average: 0.71 D.

Post-operative visual acuity > = 0.5 in % 89%.

The 2000 European Cataract Outcome Study

Study month: October 2000.

Follow-up: 6 months.

Number of participants: 39 surgeons/units.

Number of participating countries: 18.

Total number of surgeries reported: 3944

Number of cases with complete

follow-up data: 3450

Demographic data:

Percentage women 63.1%

Mean age 73.2 years

Second eye surgery 38.1%

Ocular co-morbidity in surgery eye 41.6%

Outcome data:

Induced astigmatism average:

Methods for calculation:

- subtraction method 0.63 D.

- Naeser polar value 0.75 D.

- Algebraic method 0.87 D.

Difference planned-final refraction

average: 0.81 D.

Post-operative visual acuity > = 0.5 in % 84%.

Difference in refraction between surgery eye and fellow eye

First eye surgery: 1.65 D.

Second eye surgery: 0.95 D.

The 2001 European Cataract Outcome Study

Study month: October 2001.

Follow-up: 6 months.

Number of participants: 37 surgeons/units.

Number of participating countries: 19.

Total number of surgeries reported: 4303

Number of cases with complete

follow-up data: 4024

Demographic data:

Percentage women 62.7%

Mean age 73.4 years

Second eye surgery 38.1%

Ocular co-morbidity in surgery eye 42.6%

Outcome data:

Induced astigmatism average:

Methods for calculation:

- subtraction method 0.65 D.

- Naeser polar value 0.78 D.

- Algebraic method 0.94 D.

Difference planned-final refraction average: 0.77 D.

Post-operative visual acuity > = 0.5 in % 85%.

Difference in refraction between surgery eye and fellow eye

First eye surgery: 1.55 D.

Second eye surgery: 1.05 D.

The 2002 European Cataract Outcome Study

Study month: October 2002.

Follow-up: 6 months.

Number of participants: 42 surgeons/units.

Number of participating countries: 21.

Total number of surgeries reported: 5353

Number of cases with complete

follow-up data: 4983

Demographic data:

Percentage women 64.6%

Mean age 73.5 years

Second eye surgery 39.7%

Ocular co-morbidity in surgery eye 43.7%

Outcome data:

Induced astigmatism average:

Methods for calculation:

- subtraction method 0.61 D.

- Naeser polar value 0.72 D.

- Algebraic method 0.88 D.

Difference planned-final refraction

average: 0.78 D.

Post-operative visual acuity > = 0.5 in % 85%.

Difference in refraction between surgery eye and fellow eye

First eye surgery: 1.61 D.

Second eye surgery: 1.00 D.

The 2003 European Cataract Outcome Study

Study month: October 2003.

Follow-up: 6 months.

Number of participants: 45 surgeons/units

Number of participating countries: 21.

Total number of surgeries reported: 5451

Number of cases with complete

follow-up data: 4944

Demographic data:

Percentage women 64.6%

Mean age 73.1 years

Second eye surgery 39.3%

Ocular co-morbidity in surgery eye 42.4%

Outcome data:

Induced astigmatism average:

Methods for calculation:

- subtraction method 0.55 D.

- Naeser polar value 0.71 D.

Difference planned-final refraction

average: 0.74 D.

Post-operative visual acuity > = 0.5 in % 85%.

Difference in refraction between surgery eye and fellow eye

First eye surgery: 1.61 D.

Second eye surgery: 0.89 D.

The 2004 European Cataract Outcome Study

Study month: October 2004.

Follow-up: 6 months.

Number of participants: 40 surgeons/units

Number of participating countries: 21.

Total number of surgeries reported: 4578

Number of cases with complete

follow-up data: 4088

Demographic data:

Percentage women 61.8%

Mean age 73.0 years

Second eye surgery 39.5%

Ocular co-morbidity in surgery eye 41.9%

Outcome data:

Induced astigmatism average:

Methods for calculation:

- subtraction method 0.52 D.

- Naeser polar value 0.65D.

Difference planned-final refraction

average: 0.68 D.

Post-operative visual acuity > = 0.5 in % 86%.

Difference in refraction between surgery eye and fellow eye

First eye surgery: 1.57 D.

Second eye surgery: 0.92D.

The 2005 European Cataract Outcome Study

Study month: October 2005.

Follow-up: 6 months.

Number of participants: 38 surgeons/units

Number of participating countries: 20.

Total number of surgeries reported: 4039

Number of cases with complete

follow-up data: 3334

Demographic data:

Percentage women 62.2%

Mean age 73.4 years

Second eye surgery 44.1%

Ocular co-morbidity in surgery eye 34.6%

Outcome data:

Induced astigmatism average:

Methods for calculation:

- subtraction method 0.40 D.

- Naeser polar value 0.47 D.

Difference planned-final refraction

average: 0.70 D.

Post-operative visual acuity > = 0.5 in % 90.2%.

Difference in refraction between surgery eye and fellow eye

First eye surgery: 1.59 D.

Second eye surgery: 0.72 D.

The 2006 European Cataract Outcome Study

Study month: October 2006

Follow-up: 6 months.

Number of participants: 35 surgeons/units

Number of participating countries: 15.

Total number of surgeries reported: 3983

Number of cases with complete

follow-up data: 3535

Demographic data:

Percentage women 63.5%

Mean age 75.0 years

Second eye surgery 41.6%

Ocular co-morbidity in surgery eye 37.8%

Outcome data:

Induced astigmatism average:

Methods for calculation:

- subtraction method 0.31 D.

- Naeser polar value 0.36D.

Difference planned-final refraction

average: 0.59 D.

Post-operative visual acuity > = 0.5 in % 73.6%.

Difference in refraction between surgery eye and fellow eye

First eye surgery: 1.45 D.

Second eye surgery: 0.72 D.

The 2007 European Cataract Outcome Study

Study month: October 2007

Follow-up: 6 months

Number of participants: 64 surgeons/units

Number of participating countries: 17

Total number of surgeries reported: 3561

Number of cases with complete

follow-up data: 3222

Demographic data:

Percentage women 62.5%

Mean age 74.1 years

Second eye surgery 39.8%

Ocular co-morbidity in surgery eye 35.5%

Outcome data:

Induced astigmatism average:

Methods for calculation:

- subtraction method 0.30 D.

- Naeser polar value 0.33D.

Difference planned-final refraction

average: 0.57 D.

Post-operative visual acuity > = 0.5 in % 89%.

Difference in refraction between surgery eye and fellow eye

First eye surgery: 1.48 D.

Revised: 2008-11-06