Linda Visser
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View article: On the usefulness of testing intelligence: A response to Van Hoogdalem and Bosman (2024)
On the usefulness of testing intelligence: A response to Van Hoogdalem and Bosman (2024) Open
In response to Van Hoogdalem and Bosman (2024) who advocate abandoning the use of intelligence tests at the individual level, we argue that their conclusions are too absolute and insufficiently substantiated. While we acknowledge some of t…
View article: The relation between parent-reported fine motor skills and spelling performance in different test modes
The relation between parent-reported fine motor skills and spelling performance in different test modes Open
Background Children are using digital devices earlier and more frequently than they did years ago. At the same time fine motor skills and the spelling performance of primary school children have deteriorated over the last years. There is s…
View article: Measurement Invariance of the Intelligence and Development Scales – 2 Across Language Versions, Gender, and Age
Measurement Invariance of the Intelligence and Development Scales – 2 Across Language Versions, Gender, and Age Open
We examined the factor structure and measurement invariance of the intelligence and basic skills domains of the Intelligence and Development Scales – 2 (IDS-2) with the Dutch ( N = 1,665) and German ( N = 1,672) standardization samples. Fi…
View article: Understanding Behavior in Phelan-McDermid Syndrome
Understanding Behavior in Phelan-McDermid Syndrome Open
Background Phelan-McDermid syndrome (PMS) or 22q13.3 deletion syndrome is a rare genetic disorder characterized by developmental delay, hypotonia and severely delayed speech. Behavioral difficulties are often reported in PMS, although know…
View article: Evaluation of an Online Version of the CFT 20-R in Third and Fourth Grade Children
Evaluation of an Online Version of the CFT 20-R in Third and Fourth Grade Children Open
There is growing demand for digital intelligence testing. In the current study, we evaluated the validity of an online version of the revised German Culture Fair Intelligence Test (CFT 20-R). A total of 4100 children from the third and fou…
View article: Development of a diabetic retinopathy screening model for a district health system in Limpopo Province, South Africa
Development of a diabetic retinopathy screening model for a district health system in Limpopo Province, South Africa Open
Background: Diabetes mellitus (DM) and diabetic retinopathy (DR) are important issues in the district health system (DHS) of South Africa (SA). Guidelines for the management of DR in SA were developed more than a decade ago but not effecti…
View article: Are Different Types of Learning Disorder Associated With Distinct Cognitive Functioning Profiles?
Are Different Types of Learning Disorder Associated With Distinct Cognitive Functioning Profiles? Open
Introduction: DSM-5 presented a revised conceptualization of specific learning disorders (LD). Contrary to former versions, the various types of LD—i.e., mathematics disorder, reading disorder, and writing disorder—are not treated as disti…
View article: Gender Differences in the Comorbidity of ADHD Symptoms and Specific Learning Disorders in a Population-Based Sample
Gender Differences in the Comorbidity of ADHD Symptoms and Specific Learning Disorders in a Population-Based Sample Open
Children with attention deficit hyperactivity disorder (ADHD) often exhibit comorbid specific learning disorders. In clinical samples, comorbidity in girls with ADHD tends to be more common than in boys with ADHD. However, this is not the …
View article: Implementation and evaluation of a team approach to managing diabetes mellitus and diabetic retinopathy in the South African district health system
Implementation and evaluation of a team approach to managing diabetes mellitus and diabetic retinopathy in the South African district health system Open
Background: Diabetic retinopathy (DR) screening programmes have been developed and implemented in different countries based on availability of resources. Most protocols developed for DR have been solely dedicated to DR screening without in…
View article: The effects of age, delirium and frailty on outcome after vascular surgery
The effects of age, delirium and frailty on outcome after vascular surgery Open
The life expectancy of the western population is increasing. As a result of improved surgical techniques, more elderly patients are suitable for surgery, especially vascular surgery. Frailty is a combination of illness, psychosocial stress…
View article: Development of a diabetic retinopathy screening model for a district health system in Limpopo Province, South Africa
Development of a diabetic retinopathy screening model for a district health system in Limpopo Province, South Africa Open
Background: Diabetes mellitus (DM) and diabetic retinopathy (DR) are important issues in the district health system (DHS) of South Africa (SA). Guidelines for the management of DR in SA were developed more than a decade ago but not effecti…
View article: Measurement Invariance of the Intelligence and Development Scales–2 Across Language Versions, Gender, and Age
Measurement Invariance of the Intelligence and Development Scales–2 Across Language Versions, Gender, and Age Open
We examined the factor structure and measurement invariance of the intelligence and basic skills domains of the Intelligence and Development Scales–2 (IDS-2) with the Dutch (N = 1,665) and German (N = 1,672) standardization samples. First,…
View article: Implementation and evaluation of a team approach to managing diabetes mellitus and diabetic retinopathy in the South African district health system
Implementation and evaluation of a team approach to managing diabetes mellitus and diabetic retinopathy in the South African district health system Open
Background: Diabetic retinopathy (DR) screening programmes have been developed and implemented in different countries based on availability of resources. Most protocols developed for DR have been solely dedicated to DR screening without in…
View article: Competency level assessment of healthcare practitioners in managing diabetes and diabetic eye disease in the district health system of Limpopo province, South Africa
Competency level assessment of healthcare practitioners in managing diabetes and diabetic eye disease in the district health system of Limpopo province, South Africa Open
Background: There are many gaps in the management of diabetes mellitus (DM) and diabetic eye disease in the district health system (DHS) of South Africa (SA). National guidelines recommend annual eye examinations for patients with DM.Aim: …
View article: Depression, Anxiety and Endometriosis: A systematic review and meta-analysis.
Depression, Anxiety and Endometriosis: A systematic review and meta-analysis. Open
Background: The extent of endometriosis is not directly related to the degree of symptoms, and recurrence of symptoms occurs frequently. Given that, an association with psychological distress, as in depression and anxiety disorders, is sug…
View article: Comorbidities Between Specific Learning Disorders and Psychopathology in Elementary School Children in Germany
Comorbidities Between Specific Learning Disorders and Psychopathology in Elementary School Children in Germany Open
Children with reading and/or spelling disorders have increased rates of behavioral and emotional problems and combinations of these. Some studies also find increased rates of attention-deficit/hyperactivity disorder (ADHD), conduct disorde…
View article: Comorbidities between specific learning disorders and psychopathology
Comorbidities between specific learning disorders and psychopathology Open
Code and data for Visser et al. (2020). Comorbidities between specific learning disorders and psychopathology in elementary school children in Germany. Frontiers in Psychiatry
View article: Assessment of temperament in children with profound intellectual and multiple disabilities. A pilot study into the role of motor disabilities in instruments to measure temperament
Assessment of temperament in children with profound intellectual and multiple disabilities. A pilot study into the role of motor disabilities in instruments to measure temperament Open
Research on temperament has evolved substantially throughout the last years. Assessing temperament in a child gives information about why the child reacts differently in different situations and can be seen as one of the variables playing …
View article: Stakeholders’ perspectives on the management of diabetic retinopathy for a district health system – South Africa
Stakeholders’ perspectives on the management of diabetic retinopathy for a district health system – South Africa Open
Background: Clinical practice guidelines for the management of diabetic retinopathy (DR) adopted in various countries show variations in methods of examinations, screeners and classification systems. The South African National Guidelines f…
View article: Racial Differences in Selective Laser Trabeculoplasty Efficacy
Racial Differences in Selective Laser Trabeculoplasty Efficacy Open
Goosen E, Coleman K, Visser L, Sponsel WE. Racial Differences in Selective Laser Trabeculoplasty Efficacy. J Curr Glaucoma Pract 2017;11(1):22-27.
View article: Correlation of optic neuritis and retinal nerve fibre thickness using optical coherence tomography in a cohort of multiple sclerosis patients
Correlation of optic neuritis and retinal nerve fibre thickness using optical coherence tomography in a cohort of multiple sclerosis patients Open
Background: Optical coherence tomography (OCT) is a fast, non-invasive imaging technology that produces 3D, high-resolution images of the retina. Direct visualisation of the retina allows a unique opportunity to study the effects of multip…
View article: The management of diabetic retinopathy in the public sector of eThekwini district of KwaZulu-Natal
The management of diabetic retinopathy in the public sector of eThekwini district of KwaZulu-Natal Open
Background: Estimates from the year 1990–2010 showed an increase in blindness and vision impairment (moderate or severe) because of diabetic retinopathy (DR) in Sub-Saharan Africa’s sub-regions (central, eastern, southern and western Afric…
View article: Rapid assessment of avoidable blindness in the northern eThekwini district of KwaZulu-Natal Province, South Africa
Rapid assessment of avoidable blindness in the northern eThekwini district of KwaZulu-Natal Province, South Africa Open
Aim: To determine the prevalence and causes of visual impairment, cataract surgical coverage and barriers to cataract surgery amongst people in the northern eThekwini district of KwaZuluNatal Province, South Africa.Method: Thirty-three clu…