A Comparative Study of Fusional Vergence According to Ocular Dominance in Healthy Subjects
试验速览
- 阶段
- 不适用
- 状态
- 招募中
- 入组人数
- 60
- 试验地点
- 1
- 主要终点
- Amplitude of fusional vergence
研究概览
简要总结
In orthoptics, fusional vergence (FV) measurement is one of the key tests used to assess fusion ability. These amplitudes are generally reduced in individuals with convergence insufficiency. Fusional vergence are quantified by placing a prism bar randomly in front of one eye-first for distance vision and then for near vision. Rehabilitation exercises using the prism bar are also performed in the same manner.
Depending on orthoptic practice, the prism bar is placed in front of the left eye or the right eye, in a dogmatic manner, or in front of the right eye, in a conventional manner, without any study providing any justification. However, some practitioners report interocular differences when measuring fusion amplitudes depending on which eye is prismed, while others do not.
The hypothesis put forward is that, in individuals with an interocular difference in fusional vergence, ocular dominance (sensory and motor) could be the cause of this measurement discrepancy.
The objective is therefore to compare the difference in fusional vergence depending on whether the dominant or non-dominant eye is tested, using a randomized order of eyes and tests.
If this hypothesis is confirmed (greater fusional vergence when tested on the dominant eye), this would: (1) enhance our understanding of fusion mechanisms, (2) provide more targeted insights for the assessment, quantification, and rehabilitation of fusional vergence to improve the effectiveness of orthoptic intervention.
详细描述
In orthoptics, fusional vergence (FV) measurement is one of the key tests used to assess fusion ability. These amplitudes are generally reduced in individuals with convergence insufficiency. Fusional vergence are quantified by placing a prism bar randomly in front of one eye-first for distance vision and then for near vision. Rehabilitation exercises using the prism bar are also performed in the same manner.
Depending on orthoptic practice, the prism bar is placed in front of the left eye or the right eye, in a dogmatic manner, or in front of the right eye, in a conventional manner, without any study providing any justification. However, some practitioners report interocular differences when measuring fusion amplitudes depending on which eye is prismed, while others do not.
The hypothesis put forward is that, in individuals with an interocular difference in fusional vergence, ocular dominance (sensory and motor) could be the cause of this measurement discrepancy.
The objective is therefore to compare the difference in fusional vergence depending on whether the dominant or non-dominant eye is tested, using a randomized order of eyes and tests.
If this hypothesis is confirmed (greater fusional vergence when tested on the dominant eye), this would: (1) enhance our understanding of fusion mechanisms, (2) provide more targeted insights for the assessment, quantification, and rehabilitation of fusional vergence to improve the effectiveness of orthoptic intervention.
研究设计
- 研究类型
- Observational
- 观察模型
- Other
- 时间视角
- Prospective
入排标准
- 年龄范围
- 18 Years 至 35 Years（Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •Adults between the ages of 18 and 35 with no known eye conditions, with or without ametropia. If ametropia is present: it must be corrected
- •Subjects with no history of eye surgery, including refractive surgery
- •Subjects who have been informed about the study and have freely and knowingly consented to participate in the study and to the collection of data
排除标准
- •Subjects with strabismus
- •Subjects with visual acuity of less than 20/20; or anisometropia
研究组 & 干预措施
Healthy individual
Individuals with no visual or oculomotor disorders.
干预措施: Fusional Vergence assessment (Other)
Healthy individual
Individuals with no visual or oculomotor disorders.
干预措施: Ocular dominance evaluation (Other)
Healthy individual
Individuals with no visual or oculomotor disorders.
干预措施: Complete Orthoptic (Other)
结局指标
主要结局
Amplitude of fusional vergence
时间窗: Day 0
Values of horizontal fusional vergence measured using a horizontal Berens prism bar in divergence and convergence, for distance and near vision, in the right eye and the left eye and reported in prism diopters.
Laterality ocular dominance
时间窗: Day 0
Assessment of ocular dominance for: * The dominant eye using the monocular blur test and the red-glass test * The leading eye using the Punctum Proximum of Convergence (PPC) test with the Mawas plate and bilateral prism test for oculomotor dominance * The preferred eye using the spontaneous ocular method * The target eye using the Hole-in-Card method: hole-in-card test All tests classify the ocular dominance into 3 categories : Left, Right, None.
Lateralization quotient value (LQ)
时间窗: Day 0
Determination of the lateralization quotient value by the mean of previous responses of the ocular dominance tests.
次要结局
- Assessment of the degree of agreement among the various tests for ocular dominance(Day 0)
- Agreeement between the bilateral prismatic test (new test for oculomotor dominance laterality determination and standard ocular dominance tests(Day 0)
- Assessment of the difference in fusional vergence measurements between the right and left eyes and the laterality quotient(Day 0)
- Correlation between inter-pupillary distance measurements and differences in fusion amplitude measurements between the right and left eyes(Day 0)