Related Experiment Video
Updated: May 8, 2026
05:36
Subjective Refraction Test Using a Smartphone for Vision Screening
Published on: October 18, 2024
Intelligence Quotient (IQ) in Congenital Strabismus
Abbas Bagheri1, Mohammad Reza Fallahi, Shima Tamannaifard
1Ophthalmic Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
Journal of Ophthalmic & Vision Research
|August 15, 2013
Summary
Patients with congenital strabismus demonstrate lower intelligence quotient (IQ) scores compared to the general population. This finding suggests potential genetic or strabismus-related factors influencing cognitive development in these individuals.
Area of Science:
- Ophthalmology
- Neuroscience
- Genetics
Background:
- Congenital strabismus is a common ocular misalignment present from infancy.
- The impact of congenital strabismus on cognitive function, specifically intelligence quotient (IQ), remains an area requiring further investigation.
- Understanding potential cognitive deficits associated with strabismus is crucial for comprehensive patient care and management.
Purpose of the Study:
- To evaluate the intelligence quotient (IQ) in patients diagnosed with congenital strabismus.
- To compare the IQ scores of patients with congenital strabismus to the established normal population mean.
- To explore potential correlations between IQ and factors such as amblyopia, refractive error, and strabismus type.
Main Methods:
- A cross-sectional study enrolled 109 consecutive patients with congenital strabismus scheduled for surgery over one year.
- Patients underwent evaluation for verbal, performance, and total IQ scores using standardized assessments.
- IQ scores were compared to the mean normal IQ of 100±15, with statistical analyses performed for various subgroups.
Main Results:
- The study included 109 patients (mean age 18.4±10.5 years), with 80% having less than high-school education.
- Mean verbal IQ was 87.2±19.6, performance IQ was 81±15.5, and total IQ was 83.5±18.3, all significantly lower than the normal population (P<0.01).
- Lower IQ levels were observed in patients with coexisting amblyopia and alternate deviations; urban residents had higher IQs than rural residents (P=0.02).
Conclusions:
- Patients with congenital strabismus exhibited significantly lower mean IQ scores compared to the normal population.
- The observed cognitive differences may be attributed to underlying genetic factors or acquired causes secondary to the strabismic condition.
- Further research is warranted to elucidate the complex relationship between congenital strabismus and cognitive development.
Related Concept Videos
01:29Intellectual Disability
Intellectual disability (ID) is a neurodevelopmental condition characterized by deficits in intellectual and adaptive functioning that manifest during the developmental period. This condition encompasses challenges in reasoning, memory, problem-solving, and learning, accompanied by impairments in everyday life skills, such as communication, self-care, and social interactions. Intellectual disability affects approximately 1% of the population in the United States, impacting an estimated 5...
01:29Environmental Influences on Intelligence
Despite the strong genetic influence on traits like intelligence, environmental factors significantly shape outcomes. For example, while over 90% of height variation is due to genetic differences, environmental factors such as nutrition also have a notable impact. Similarly, for intelligence, changes in a child's surroundings can significantly alter their IQ. Research shows that enriched environments boost children's academic success and help them develop key cognitive skills. Children from...
01:30Biological Influences on Intelligence
Intelligence is often thought to be linked to brain size, but the relationship is more complex than that. While brain size does correlate modestly with some abilities, like verbal skills, the connection is weaker for others, such as spatial reasoning. Other factors, like brain structure, also play crucial roles. For instance, despite Einstein's smaller-than-average brain, his parietal cortex, which is involved in spatial reasoning, was 15% wider, suggesting that neural density might matter more...
01:23Binet's Contribution to Measures of Intelligence
Alfred Binet, along with his student Théophile Simon, was tasked by the French Ministry of Education in 1904 to create a method for identifying students who struggled to learn through conventional classroom instruction. This initiative aimed to address overcrowding by placing such students in specialized schools. Binet and Simon developed an intelligence test comprising 30 tasks, ranging from simple commands, like touching one's nose or ear, to more complex tasks, such as drawing designs from...
01:23Wechsler's Contribution to Measures of Intelligence
David Wechsler, a psychologist who worked with World War I veterans, developed a significant IQ test in 1939 called the Wechsler-Bellevue Intelligence Scale. This test was innovative because it combined several subtests that measured both verbal and nonverbal skills, reflecting Wechsler's belief that intelligence is a global capacity involving purposeful action, rational thinking, and effective interaction with the environment. This test later evolved into the Wechsler Adult Intelligence Scale...
01:24Triarchic Theory of Intelligence
Robert Sternberg's triarchic theory of intelligence posits that intelligence is composed of three distinct but interrelated components: analytical, creative, and practical intelligence.