Validation of the BESSt Formula in eyes undergoing phacoemulsification following keratorefractive surgery

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

ISRCTN

Registry ID

ISRCTN34442493

Enrollment

Registered

2007-09-28

Start date

2006-08-01

Completion date

Unknown

Last updated

2015-01-13

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Eye Diseases: Cataract Eye Diseases Cataract

Interventions

1. BESSt© 2. Hollday

Eligibility

Inclusion criteria

Inclusion criteria: 1. Any eye undergoing phaco following keratorefractive surgery 2. Any intraocular lens (IOL) model 3. Any type of keratorefractive surgery 4. Patients under the care of Ms Ficker or Mr Stevens

Exclusion criteria

Exclusion criteria: 1. Children 2. Corneal scarring or opacity 3. Severe dry eyes or ptosis 4. Complicated phaco, presence of a rhexis tear if IOL is implanted in bag

Design outcomes

Primary

Measure	Time frame
1. Patient recruitment rates 2. Rates of loss to follow up in treatment arm 3. Difference between target and achieved manifest refraction following phaci in the two groups	—

Secondary

Measure	Time frame
Proportion of eyes with outcomes within +0.25/0.5/0.75/1/1.50/2.0D from the target refraction using the different formulae	—

Countries

United Kingdom

Outcome results

None listed

Source: ISRCTN (via WHO ICTRP) · Data processed: Feb 4, 2026