Eyes and vision with ADHD
A number of studies have identified various visual problems in children with ADHD. These include visuoperceptual problems, convergence insufficiency, impaired stereoacuity, more frequent refractive errors, an increased risk of strabismus and astigmatism, as well as deviations in eye movements and accommodation. ADHD is also associated with neurophysiological changes in the optic nerves, genetic correlations with the DRD4 dopamine receptor gene and asymmetrical pupil diameters. Visuomotor function, i.e. the coordination of visual perception and the locomotor system, correlates with cognitive abilities such as inhibition and cognitive flexibility.
ADHD is characterized by an impaired dopamine system with reduced extracellular dopamine.
Dopamine is also involved in the visual system.12345
Reduced visual performance was found in 76% of the children with ADHD examined.6 A meta-analysis of 35 studies with 3,250,905 participants found a 94% increased risk of unspecified visual problems in ADHD (OR = 1.94).7
Young adults with ADHD showed more problems with depth perception, peripheral vision and color perception, especially in the blue spectrum, compared to non-affected individuals.89
ADHD medication improved visual field abnormalities and visual acuity in children with ADHD.10 Another study found no significant improvements.6 In a small study, surgical treatment of strabismus improved ADHD symptoms in 7 out of 8 persons with ADHD in the parent report.11
A small study was able to distinguish people with ADHD from those without ADHD quite well using eye movement tracking.12
It is therefore conceivable that eye problems can cause or exacerbate ADHD symptoms, just as ADHD can cause or exacerbate eye problems.
- 1. Visuoperceptive problems in ADHD (+ 1000 %)
- 2. Convergence insufficiency and ADHD (+ 200 % to + 400 %)
- 3. Stereoacuity (stereotactic vision, depth perception) in ADHD (+ 333 %)
- 4. Strabismus / heterophoria (strabismus / latent strabismus) in ADHD (+ 93 % to + 700 %)
- 5. Astigmatism in ADHD (+ 79 % to + 300 %)
- 6. Eye movements and ADHD
- 7. Shifts in the field of vision
- 8. Macular thickness in ADHD
- 9. Accommodation for ADHD
- 10. Neurophysiological changes in the optic nerves in ADHD
- 11. DRD4-7R and vision in ADHD
- 12. Refractive errors (defective vision) and ADHD
- 13. Visuomotor skills correlate with inhibition and cognitive flexibility
- 14. Retinal detachment, retinal fractures
- 15. Unchanged eye parameters
1. Visuoperceptive problems in ADHD (+ 1000 %)
One study found visuoperceptual problems in 21% of children with ADHD, compared to only 2% of those not affected.6
2. Convergence insufficiency and ADHD (+ 200 % to + 400 %)
Eye convergence refers to opposite / disjugate / disjunctive eye movements.
A meta-analysis of 35 studies with 3,250,905 participants found a fivefold risk of a reduced near-convergence point in ADHD (OR = 5.02).7
One study found convergence insufficiency in 24% of children with ADHD, compared with only 6% of those not affected.6
Several other studies found children with convergence insufficiency were 3 times more likely to have ADHD than those without.1314
Another study found significant abnormalities in people with ADHD in the modulation of the eye vergence response during attention tasks. The diagnostic test accuracy was 79 %.15
3. Stereoacuity (stereotactic vision, depth perception) in ADHD (+ 333 %)
Stereoacuity is the ability of a person to recognize objects along different distances as separate entities.
Several studies report impaired stereoacuity in children with ADHD.16 Stereoacuity (depth perception) was impaired in 26% of children with ADHD, compared to 6% of non-affected children.6
4. Strabismus / heterophoria (strabismus / latent strabismus) in ADHD (+ 93 % to + 700 %)
One study found in children with ADHD
- More strabismus (squinting) (17% compared to 2% in non-affected people)6
- More heterophoria (latent strabismus) (27 % compared to 10 % in non-affected people)6
One cohort study found a 15% increased risk of ADHD with strabismus.17 Another cohort study found a doubled risk of ADHD with strabismus convergens (internal strabismus, esotropia) and a 44% increased risk of ADHD with strabismus divergens (external strabismus, exotropia).18
A meta-analysis of 35 studies with 3,250,905 participants found a 93% increased risk of strabismus (OR = 1.93) and a 79% increased risk of hyperopia and hypermetropia (OR = 1.79) with ADHD.7
An evaluation of the KiGGS study (N = 13,488) found strabismus in 8.2% of children with ADHD compared to 4.2% of people with ADHD who were not affected (OR 2.04).19
ADHD and hyperopia, myopia, astigmatism and strabismus predicted each other.20
5. Astigmatism in ADHD (+ 79 % to + 300 %)
One study found astigmatism in 24% of children with ADHD, compared to only 6% of those without the condition.6
A meta-analysis of 35 studies with 3,250,905 participants found a 79% increased risk of astigmatism in ADHD (OR 1.79).7
An evaluation of the KiGGS study (N = 13,488) found strabismus in 10.9% of children with ADHD compared to 6.9% of people with ADHD who were not affected (OR 1.84).19
ADHD and hyperopia, myopia, astigmatism and strabismus predicted each other.20
6. Eye movements and ADHD
An experimental study (n = 16) reported significant abnormalities of eye movements in ADHD as determined by electrooculography (EOG).21
One large study found a correlation between premature anticipatory eye movements and inattention, but not between directional errors and ADHD symptoms.22
6.1. Saccades
Several studies found slower and more variable saccadic reaction times in children with ADHD using the gap/overlap test. One study was able to eliminate this biomarker using warning signals during the test.23
A meta-analysis found evidence that children with ADHD24
- made more directional errors in an antisaccade task
- were slower and performed worse in oculomotor tasks
- Performed eye movements less precisely
Saccadic eye movements (gaze jumps) are strongly influenced by factors such as attention and inhibition.2526 Since attention and inhibition are impaired in ADHD, it seems plausible that saccadic eye movements are abnormal in ADHD.
Arbitrary eye movements are controlled by the dlPFC: The arbitrary control of eye movements is closely linked to attention control. The dlPFC also houses the working memory, which is typically impaired in ADHD.
People with ADHD showed increased saccade latency and intensity and shorter fixation time in eye-tracking tasks.27
In the antisaccade task, prolonged latencies were found in ADHD and even more so in schizophrenia, further in bipolar Disorder and with smaller and less robust effect sizes in Obsessive-Compulsive Disorder. There appear to be deficits in inhibitory control in the antisaccade task in all mental disorders, particularly in error rates.28
Faster visual orienting due to shorter saccadic reaction times (SRTs) was found on baseline trials compared to overlap trials, for faces compared to non-face stimuli and, more clearly in children without ADHD and/or autism, for multimodal compared to unimodal stimuli. There was a linear negative correlation between presaccadic pupil size and SRTs in children with ADHD without ADHD, and a quadratic correlation in children with ADHD without ADHD, in whom SRTs were slower when intraindividual presaccadic pupil size was smallest or largest.29
The deviations of saccadic eye movements in ADHD are said to be improvable through computer training.30
Individuals with borderline personality disorder and comorbid ADHD showed inadequate response preparation, resulting in reduced visual fixation on task cues and greater variability in saccade responses (i.e., saccade response time and peak velocity). Saccadic deficits in borderline as in ADHD with comorbid borderline do not appear to be due to an inability to perform antisaccades, but rather to inadequate preparation for the task at hand. This could result from abnormal signaling in cortical areas such as the frontal eye fields, posterior parietal cortex and ACC.31
6.2. Pupil speed
One study found significantly higher pupillary velocity scores in children with ADHD that correlated positively with RNFL measurements of their right eyes.32
6.3. Pupil diameter, pupil restlessness
Adults with ADHD were found to have
- a reduced performance of pupillary oscillations during passivity with minimal distraction as well as during resting conditions without distraction. This is a sign of generally reduced catecholaminergic activity that is independent of the visual task or ongoing cognitive effort.33
- reduced pupil dilation during a task with sustained visual attention34
The very restrictive data publication of the authors could be an indication of potential diagnostic usability.
Pupillary restlessness correlates to a high degree between the two eyes. This indicates a source of control at the level of the Edinger-Westphal complex in the midbrain, which acts jointly for both irises.33 The Edinger-Westphal complex is the most important parasympathetic preganglionic motor node for the pupillary sphincter and is connected to the catecholaminergic network via various pathways, including the locus coeruleus. The noradrenergic activity of the locus coeruleus significantly influences the pupil diameter.
The locus coeruleus is the definitive source of noradrenaline in the brain, and strongly influences neuronal dopamine function and dopaminergic receptors.33 To date, no direct neurological projections between the locus coeruleus and the Edinger-Westphal complex are known. There may be an indirect connection via intermediate circuits. In addition, the Edinger-Westphal complex is modulated by the neocortex and hypothalamus. Attention influences the basal tension of the pupil dilator muscle via the pupillary sympathetic nervous system. This may enhance the biomechanical push-pull mechanism of the sphincter-pupil dilator muscle system and increase the sensitivity and magnitude of pupillary oscillations.33
Tonic and phasic norepinephrine firing can be recognized by the pupil diameter.
Here, the basal size of the pupil diameter corresponds to tonic noradrenaline firing and a change in pupil diameter corresponds to phasic noradrenergic activity. A phasic pupil dilation correlated with correct responses, a tonic pupil dilation with periods of low reward value.3536 An increase in baseline pupil diameter correlated with a decrease in task utility and disengagement from the task (exploration), a decrease in baseline pupil diameter with an increase in task-induced dilation correlated with engagement in the task (exploitation)37
Pupil dilation is a physiological index of increased arousal and noradrenergic activity of the locus coeruleus.23
The pupil diameter in the resting state also reflects the connectivity between frontoparietal, striatal and thalamic brain regions.38
LC-NE tonic and phasic activity are indexed by baseline pupil size (BPS) and stimulus-evoked pupillary response (SEPR).
Measurements of pupil diameter show abnormalities in the noradrenergic system in ADHD.
More on this at Tonic and phasic noradrenaline in ADHD In the article Noradrenaline.
Pupil dilation amplitudes to relatively unexpected spatial target stimuli:39
- for ADHD
- shorter pupil dilation latencies compared to ASA, ASA + ADHD and controls.
- for ASD and ASD + ADHD
- slower orientation reactions than controls
- higher pupil dilation amplitudes compared to ADHD and controls
ADHD medication significantly increased the pupil diameter (3.91 mm compared to 3.58 mm, p = 0.017).40
7. Shifts in the field of vision
Another study found that in children, visual field shifts moderated the relationship between hyperactivity/impulsivity on the one hand and problems focusing attention and taking in information on the other. Visual field shifts increased with a decrease in performance accuracy, although this correlation did not reflect the severity of the symptoms.41
8. Macular thickness in ADHD
A small study hypothesizes that increased macular thickness in children with AD(H)D may represent the increased ratio of right frontal lobe to parietal cortex thickness in ADHD.42
9. Accommodation for ADHD
Children with ADHD showed a reduced accommodative response that was not influenced by the accommodative stimulus. There was no clear effect of medication in ADHD on accommodation accuracy.43 Accommodation refers to the ability of the eye to focus / focus on objects at different distances.
A meta-analysis of 35 studies with 3,250,905 participants found an increased risk for increased delay (Hedge’s g = 0.63 [CI: 0.30, 0.96]) and variability (Hedge’s g = 0.40 [CI: 0.17, 0.64]) of accommodative response in ADHD.7
10. Neurophysiological changes in the optic nerves in ADHD
One study found smaller optic nerves, smaller neuroretinal rim areas or reduced retinal artery tortuosity more frequently in children with ADHD.6
11. DRD4-7R and vision in ADHD
The D4 dopamine receptor gene, DRD4, is significantly involved in the conversion of light into electrical signals in the retina. The transcription of DRD4 shows a strong circadian pattern.5
The DRD4 7R variant is one of the strongest single-gene risks for ADHD. See also ⇒ Candidate genes in ADHD In the chapter ⇒ Origin.
DRD4-7R correlates with a lower ability to reduce the light-sensitive second messenger cyclic adenosine monophosphate (cAMP) upon illumination.44
In addition, DRD4-7R correlates with higher daytime sleepiness45, which could be a consequence of the seesaw between dopamine and melatonin.
12. Refractive errors (defective vision) and ADHD
One study found refractive errors in 83% of the children with ADHD examined.46 A meta-analysis of 35 studies with 3,250,905 participants found no accumulation of refractive errors in ADHD (Hedge’s g = 0.08 [CI: -0.26, 0.42]).7
A dysfunction of retinal dopamine could influence the neurodevelopmental growth of the eye, leading to refractive errors. This could help explain the frequency of refractive errors in ADHD.4647
There is increasing evidence that the worldwide increase in myopia is dopaminergic mediated and related to a lack of daylight.
Between 1981 and 2002, outdoor activities halved from 1 hour 40 minutes per week to 50 minutes per week.48
Among people with ADHD, the prevalence of cycloplegia was significantly higher in unmedicated subjects (69.6%) than in medicated subjects (69.9% vs. 37.5%, p = 0.026).40
12.1. Farsightedness (hyperopia) (+ 67 %)
An evaluation of the KiGGS study (N = 13,488) found farsightedness in 13.0% of children with ADHD compared to 8.2% of people with ADHD who were not affected (OR 1.67).19
ADHD and hyperopia, myopia, astigmatism and strabismus predicted each other.20
12.2. Short-sightedness (myopia) (+ 29 %)
An evaluation of the KiGGS study (N = 13,488) found myopia in 16.2% of children with ADHD compared to 13.1% of people with ADHD who were not affected (OR 1.29).19
ADHD and hyperopia, myopia, astigmatism and strabismus predicted each other.20
13. Visuomotor skills correlate with inhibition and cognitive flexibility
Visuomotor skills are the coordination of visual perception and the musculoskeletal system and include eye-hand coordination.
A study reports:49
Visuomotor fluency correlated significantly with cognitive inhibition. The ability to perform visually guided, continuous movements fluently correlates with the ability to inhibit the effects of distracting information.
Visuomotor flexibility correlated significantly with cognitive flexibility. The ability to spontaneously use visual information to flexibly change motor responses correlates with the ability to cognitively switch from one state of mind to another.
14. Retinal detachment, retinal fractures
Exposure to retinal detachments and breaks was associated with a 19% increased risk of attention deficit hyperactivity disorder.50
15. Unchanged eye parameters
- Retinal nerve fiber layer thickness unchanged. A meta-analysis of 35 studies with 3,250,905 participants found no change in retinal nerve fiber layer thickness in ADHD (Hedge’s g = -0.19 [CI: -0.41, 0.02]) .7
- Axle length unchanged40
- Corneal topography parameters unchanged40
- Properties of the front chamber unchanged40
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