COMPARISON OF ACCOMMODATION AND COLOR VISION AT VARIOUS LEVELS OF LED CORRELATED COLOR TEMPERATURES
试验速览
- 阶段
- 1 期
- 状态
- 已完成
- 发起方
- 入组人数
- 34
- 试验地点
- 2
- 主要终点
- Accommodation-Dioptre, Time-Seconds,Color vision-Errors (number),Color Temperature-Kelvin
研究概览
简要总结
Testing of accommodation under various colour temperatures gives an idea about the reason behind the accommodation variation, setting up lighting Standards for a clinic , Pupil size change can be related to accommodation, Tunable LED light can be used for colour vision testing and for low vision patient (since it is color temperature tunable). (CCT-Correlated Color Temperature)
Accommodation- MEM Retinoscopy (Monocular estimation method), Negative relative accommodation and Positive relative accommodation, Minus lens method and pupil size is measured by Plus Optix Paediatric Autorefractometer. Color vision in Farnsworth D15 and Ishihara plates.
Adaptation Time- 5 Minutes , Lux level of 270 lux for farnsworth D15 test, Accommodation testing of 430 lux. Only CCTs which has highest CRI (Color Rendering Index) is selected for color vision testing and changes in accommodation is seen with respect to CRI ,SPD and CCT.
Here under each 6 lighting conditions, pupil size and accommodative response was measured. Then the other factors like Negative relative accommodation(NRA), Positive relative accommodation(PRA), Minus lens method was measured to prevent visual fatigue. Then at higher CRI (93,93,94) lightings of 5500K, 6500K and 8000K, the color vision testing was done. These were then analyzed using Repeated measures of ANOVA and Pair t test. Then the accommodation and pupil size change was compared with that of under natural light. The natural light measurement was done at MIT ground(Latitude-13.343581,Longitude- 74.794044) . This then gives idea about the change in accommodative response.
Hypothesis testing:
a. Null hypothesis: There is no change in accommodation and color vision with respect to CCT variation
b. Alternate Hypothesis: There is a change in accommodation and color vision with respect to CCT variation
研究设计
- 研究类型
- Interventional
- 分配方式
- Not Applicable
- 盲法
- Not Applicable
入排标准
- 年龄范围
- 18.00 Year(s) 至 35.00 Year(s)（—）
- 性别
- All
入选标准
- •1.Age 18 to 35 years 2.Not on any medications 3.No diplopia reported during the ocular motility test 4.Near point of convergence (RAF rule) ≤ 10cm 5.Amplitude of accommodation (push up RAF rule) normal for age (greater than 10D) 6.Stereo acuity (Titmus circles) of < 80 seconds of arc 7.Normal red/green colour vision (Ishihara) 8.Astigmatism of < 0.75DC 9.Visual acuity of at least 6/6 in each eye 10.Cover test of < 5Δ horizontal phoria and < 0.5Δ vertical phoria.
排除标准
- •â€¢Any known ocular pathology •Binocular vision anomalies •Systemic diseases affecting vision •Any colour vision defects •Migraine or history of migraine.
结局指标
主要结局
Accommodation-Dioptre, Time-Seconds,Color vision-Errors (number),Color Temperature-Kelvin
时间窗: 5 minutes after adaptation to light (Accommodation measurement), next intervals (1 minute accommodation relaxation time is given), then continued on between each intervals for accommodation. For color vision only adaptation time and no accommodation relaxation time.Total timing of 2 hours per subject.
次要结局
- Pupil size-Millimeter,CRI-Color Rendering Index(Pupil size measurement is taken which is done immediately after 5 minutes adaptation time, CRI and color temperature is interrelated and is measured during the lighting setup.)