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Non-prismatic and prismatic loupes in simulated surgical tasks among surgeons – a controlled, randomized cross-over laboratory trial

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

ISRCTN

Registry ID

ISRCTN34385943

Enrollment

Registered

2022-01-22

Start date

2020-04-03

Completion date

Unknown

Last updated

2024-03-11

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

Conditions

Work-related musculoskeletal disorders Musculoskeletal Diseases

Interventions

This randomized cross-over study enrolled eligible surgeons in an academic hospital in Sweden from September to December 2021, to compare two prismatic loupes (new) and one non-prismatic loupes (conve

Eligibility

Sex/Gender

All

Inclusion criteria

Inclusion criteria: 1. Currently actively working as surgeons 2. Work experience as surgeons =2 years 3. Work actively with open surgeries in vascular surgery or in otorhinolaryngology (endocrine surgery) 4. Never used prismatic surgical loupes 5. No age limitations (due to sufficiency of other criteria)

Exclusion criteria

Exclusion criteria: 1. Experienced severe discomfort when using any surgical loupes during the experiment 2. Experienced severe discomfort due to the technical measurement of ergonomic exposure

Design outcomes

Primary

Measure	Time frame
1. Physical workload including: 1.1. Inclination angle and velocity of head, trunk and both upper arms measured using inertial measurement units during each task with each type of surgical loupes 1.2. Muscle activity of cervical erector spinae, trapezius and lumbar erector spinae measured using electromyography during each task with each type of surgical loupes	—

Secondary

Measure	Time frame
1. Perceived visual quality measured using 5-point Likert-type scale or 4-point scale depending on questions with each type of surgical loupes at the end of each task 2. Perceived body-part discomfort measured using a Borg CR-10 scale with each type of surgical loupes at the end of each task 3. Surgical performance, including task completion duration measured using a timer, and number of errors evaluated by two independent surgeons with each type of surgical loupes at the end of each task 4. Subjective evaluations and preferences of loupes measured using a semi-structured interview on the same day at the end of the study	—

Measure

Time frame

1. Perceived visual quality measured using 5-point Likert-type scale or 4-point scale depending on questions with each type of surgical loupes at the end of each task 2. Perceived body-part discomfort measured using a Borg CR-10 scale with each type of surgical loupes at the end of each task 3. Surgical performance, including task completion duration measured using a timer, and number of errors evaluated by two independent surgeons with each type of surgical loupes at the end of each task 4. Subjective evaluations and preferences of loupes measured using a semi-structured interview on the same day at the end of the study

—

Countries

Sweden

Contacts

Public ContactXuelong Fan

xuelong.fan@ki.se+46 (0)720328083

Outcome results

None listed

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