Investigating the effect of ‘blue-blocking’ spectacle lenses on eye structure and visual functions

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

IRCT

Registry ID

IRCT20251007067537N1

Enrollment

Registered

2025-10-20

Start date

2025-11-01

Completion date

Unknown

Last updated

2025-12-08

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

Conditions

Healthy people.

Interventions

Intervention 1: Intervention group: Standard optical lens without POWER with blue light filtering coating. Intervention 2: Control group: Standard optical lens without power, without coating. Interven

Eligibility

Sex/Gender

All

Inclusion criteria

Inclusion criteria: Living in a dormitory No history of wearing glasses No refractive error

Exclusion criteria

Exclusion criteria: PTOSIS History of antihistamine and antidepressant use Night shift Media opacity History of eye surgery and contact lens use

Design outcomes

Primary

Measure	Time frame
Tear secretion rate. Timepoint: Before starting, one month and 3 months. Method of measurement: shirmer test.;Tear stability time. Timepoint: Before starting, one month and 3 months. Method of measurement: TBUT (TEAR BREAK OF TIME) test.;OSDI (ocular surface disease index) Questionnaire Score. Timepoint: Before starting, one month and 3 months. Method of measurement: Formula provided for the questionnaire.;Number of blinks. Timepoint: Before starting, one month and 3 months. Method of measurement: Counting and averaging in standard relaxed film.;Amplitude of accommodation. Timepoint: Before starting, one month and 3 months. Method of measurement: Using a minuses lens.;Accommodation facility. Timepoint: Before starting, one month and 3 months. Method of measurement: with ±2 lenses.;Amplitude of divergence. Timepoint: Before starting, one month and 3 months. Method of measurement: b.in prism.;Visual acuity. Timepoint: Before starting, one month and 3 months. Method of measurement: snellen chart.;Amplitude of convergence. Timepoint: Before starting, one month and 3 months. Method of measurement: b.out prism.;Lag of accommodation. Timepoint: Before starting, one month and 3 months. Method of measurement: MEM(Monocular estimated method) TEST.;Sleep quality. Timepoint: Before starting, one month and 3 months. Method of measurement: Pittsburgh Sleep Quality Index (PSQI)Questionnaire.;Thickness of the retinal nerve layers. Timepoint: Before starting, one month and 3 months. Method of measurement: Optical coherence tomography (OCT).	—

Measure

Time frame

Tear secretion rate. Timepoint: Before starting, one month and 3 months. Method of measurement: shirmer test.;Tear stability time. Timepoint: Before starting, one month and 3 months. Method of measurement: TBUT (TEAR BREAK OF TIME) test.;OSDI (ocular surface disease index) Questionnaire Score. Timepoint: Before starting, one month and 3 months. Method of measurement: Formula provided for the questionnaire.;Number of blinks. Timepoint: Before starting, one month and 3 months. Method of measurement: Counting and averaging in standard relaxed film.;Amplitude of accommodation. Timepoint: Before starting, one month and 3 months. Method of measurement: Using a minuses lens.;Accommodation facility. Timepoint: Before starting, one month and 3 months. Method of measurement: with ±2 lenses.;Amplitude of divergence. Timepoint: Before starting, one month and 3 months. Method of measurement: b.in prism.;Visual acuity. Timepoint: Before starting, one month and 3 months. Method of measurement: snellen chart.;Amplitude of convergence. Timepoint: Before starting, one month and 3 months. Method of measurement: b.out prism.;Lag of accommodation. Timepoint: Before starting, one month and 3 months. Method of measurement: MEM(Monocular estimated method) TEST.;Sleep quality. Timepoint: Before starting, one month and 3 months. Method of measurement: Pittsburgh Sleep Quality Index (PSQI)Questionnaire.;Thickness of the retinal nerve layers. Timepoint: Before starting, one month and 3 months. Method of measurement: Optical coherence tomography (OCT).

—

Countries

Iran (Islamic Republic of)

Contacts

Public ContactSeyed Saber Sahihalnasab

Shahid Beheshti University of Medical Sciences

saber.sahih@yahoo.com+98 21 4470 8392

Outcome results

None listed

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