Hahsler 2005.

Methods	Study design: RCT Study grouping: parallel group, with inter‐eye comparison (i.e., one eye received a blue‐light filtering IOL and the fellow eye received a non‐blue‐light filtering IOL) Exclusions after randomisation: not reported Losses to follow‐up: not reported How missing data were handled: not reported Reported power size calculation? no
Participants	Baseline characteristics Blue‐light filtering IOL Number of participants: number of people (number of eyes): 20 (20) Sex (number of women/number of men): not reported Age (mean ± unit of error): not reported Non‐blue‐light filtering IOL Number of participants: number of people (number of eyes): 20 (20) Sex (number of women/number of men): not reported Age (mean ± unit of error): not reported Inclusion criteria: not reported Exclusion criteria: not reported Comparison of study groups at baseline: not reported
Interventions	Intervention characteristics Blue‐light filtering IOL Type of IOL: HOYA‐YA (Hoya) or SN60 (Alcon) Non‐blue‐light filtering IOL Type of IOL: HOYA‐VA (Hoya) or SA60 (Alcon)
Outcomes	Functional acuity contrast test and contrast sensitivity; follow‐up period not reported
Identification	Sponsorship source: Funding sources: not reported Declaration of interest: not reported Country: Austria Setting: not reported Comments: Date study conducted: not reported Trial registration number: not reported Contacting study investigators: study authors contacted for more information about abstract; no additional information provided for review First author's name: B Hahsler Institution: not reported Email: not reported Address: not reported
Notes	Conference abstract, in German
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Judgement comment: not reported how list was generated
Allocation concealment (selection bias)	Unclear risk	Judgement comment: not reported how allocation administered. Study is described as “randomised” but with no further details
Blinding of participants and personnel (performance bias) All outcomes	High risk	Judgement comment: no information provided on masking
Blinding of outcome assessment (detection bias) All outcomes	High risk	Judgement comment: no information provided on masking
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	Judgement comment: follow‐up not reported
Selective reporting (reporting bias)	Unclear risk	Judgement comment: no access to protocol or trials registry entry
Other bias	Unclear risk	Judgement comment: insufficient information in abstract to assess other potential sources of bias