Publications by authors named "Jan E E Keunen"

Background: Among older people undiagnosed and untreated vision impairment and blindness are common. The leading causes are uncorrected refractive errors and cataracts. Vision problems are associated with a lower quality of life, several health problems, and a higher chance of falling accidents and fractures.

View Article and Find Full Text PDF

The art heritage that has survived from medieval and early modern hospitals situated in the north of the Netherlands should be considered in the context of the multifunctional character hospitals had at the time. As a result, the heritage does not compare well with the role and function of visual art in hospitals of the 20th and 21st centuries. However, commissioning art in hospitals and other healthcare facilities is an old and fascinating tradition that, like all good traditions, changes with time.

View Article and Find Full Text PDF

Purpose: To investigate the agreement between an online nurse-assisted eye-screening tool and reference tests in older adults receiving home healthcare and to collect user experiences.

Methods: Older adults (65+) receiving home healthcare were included. Home healthcare nurses assisted in administering the eye-screening tool at participants' homes.

View Article and Find Full Text PDF
Article Synopsis
  • High myopia is increasingly common globally, leading to a rise in vision-related issues; however, research on its complications in Europeans is limited.
  • The study aimed to evaluate the prevalence of myopic macular features among Europeans with high myopia, involving 626 patients from the Dutch Myopia Study and the Rotterdam Study.
  • Results showed that 25.9% had myopic macular degeneration, which was more prevalent in older individuals, those with lower spherical equivalent refractive errors, and greater axial length.
View Article and Find Full Text PDF

Purpose: Comparing the effect of half-dose photodynamic therapy and high-density subthreshold micropulse laser treatment on retinal pigment epithelial detachments (PEDs) in chronic central serous chorioretinopathy.

Methods: This study included data from the PLACE trial, a prospective randomized controlled trial comparing half-dose photodynamic therapy and high-density subthreshold micropulse laser treatment in chronic central serous chorioretinopathy. Main outcome measurements were changes in both the foveal PED and the highest PED within the macula at baseline compared with first and final evaluation visit.

View Article and Find Full Text PDF

Purpose: To compare the effects of half-dose photodynamic therapy (PDT) and high-density subthreshold micropulse laser on choroidal dysfunction evaluated by degree and extent of hyperfluorescence on indocyanine green angiography (ICGA) in chronic central serous chorioretinopathy.

Methods: Data from the multicenter, randomized, controlled PLACE trial were used in this study. Hyperfluorescent and hypofluorescent areas on ICGA, their association with subretinal fluid and visual function were assessed.

View Article and Find Full Text PDF
Article Synopsis
  • The study investigates the impact of the GJD2 gene on myopia (nearsightedness) across different age groups, looking specifically at its relationship with refractive error and eye measurements.
  • Using data from three major population studies, researchers measured various eye metrics (like spherical equivalent and axial length) in relation to different GJD2 genotypes and assessed lifestyle factors' effects.
  • Results showed that individuals with two risk alleles had worse eye measurements, indicating a dose-response effect that begins in early childhood, suggesting that this gene could significantly influence the development of myopia.
View Article and Find Full Text PDF

Purpose: To describe the treatment outcomes and recurrence risk of chronic central serous chorioretinopathy (cCSC) in patients who had complete resolution of subretinal fluid (SRF) after either primary half-dose photodynamic therapy (PDT) or high-density subthreshold micropulse laser (HSML) in the PLACE trial.

Methods: This multicentre prospective follow-up study evaluated cCSC patients at 1 year after completion of the PLACE trial. Outcomes included: complete resolution of SRF on OCT, best-corrected visual acuity (BCVA) in Early Treatment of Diabetic Retinopathy Study (ETDRS) letters, retinal sensitivity on microperimetry and a visual function questionnaire (NEI-VFQ25).

View Article and Find Full Text PDF

Central serous chorioretinopathy (CSC) is a common cause of central vision loss, primarily affecting men 20-60 years of age. To date, no consensus has been reached regarding the classification of CSC, and a wide variety of interventions have been proposed, reflecting the controversy associated with treating this disease. The recent publication of appropriately powered randomised controlled trials such as the PLACE trial, as well as large retrospective, non-randomised treatment studies regarding the treatment of CSC suggest the feasibility of a more evidence-based approach when considering treatment options.

View Article and Find Full Text PDF

Purpose: To compare the outcome between high-density subthreshold micropulse laser (HSML) treatment and half-dose photodynamic therapy (PDT) in chronic central serous chorioretinopathy (cCSC) patients, subdivided based on either focal or diffuse leakage on fluorescein angiography (FA).

Design: Retrospective analysis of multicenter randomized controlled trial data.

Methods: Patients were treated with either half-dose PDT or HSML (both indocyanine green angiography-guided) and categorized in 2 groups, based on focal or diffuse leakage on FA.

View Article and Find Full Text PDF

Background/aim: To validate a previously developed model for prediction of diabetic retinopathy (DR) for personalised retinopathy screening in persons with type 1 diabetes.

Methods: Retrospective medical data of persons with type 1 diabetes treated in an academic hospital setting were used for analysis. Sight-threatening retinopathy (STR) was defined as the presence of severe non-proliferative DR, proliferative DR or macular oedema.

View Article and Find Full Text PDF

Background: Central serous chorioretinopathy (CSC) is a chorioretinal disease characterized by fluid accumulation between the neuroretina and retinal pigment epithelium with unknown etiology. Family studies have suggested a heritable component for CSC with an autosomal dominant inheritance pattern. Therefore, exome sequencing was performed on familial cCSC to indentify the genetic components contributing to familial cCSC.

View Article and Find Full Text PDF

Purpose: To report a patient with bilateral diffuse uveal melanocytic proliferation (BDUMP) due to a lung carcinoma, who survived 9.5 years with preservation of good visual acuity after cataract surgery and curative chemotherapy with neoadjuvant radiation therapy.

Methods: Clinical review of a patient with BDUMP.

View Article and Find Full Text PDF

Importance: To date, several targeted genetic studies on chronic central serous chorioretinopathy (cCSC) have been performed; however, unbiased genome-wide studies into the genetics of cCSC have not been reported. To discover new genetic loci associated with cCSC and to better understand the causative mechanism of this disease, we performed a genome-wide association study (GWAS) on patients with cCSC.

Objective: To discover new genetic loci and pathways associated with cCSC and to predict the association of genetic variants with gene expression in patients with cCSC.

View Article and Find Full Text PDF

Purpose: To compare the anatomic and functional efficacy and safety of half-dose photodynamic therapy (PDT) versus high-density subthreshold micropulse laser (HSML) treatment in patients with chronic central serous chorioretinopathy (cCSC).

Design: Open-label, multicenter, randomized controlled clinical trial.

Participants: Patients with cCSC whose disease had to be confirmed by both clinical characteristics and findings on multimodal imaging.

View Article and Find Full Text PDF

Purpose: To assess ophthalmologic characteristics in patients and unaffected individuals in families with multiple members affected by central serous chorioretinopathy (CSC), both at presentation and long-term follow-up.

Methods: In 103 subjects from 23 families with at least 2 affected patients with CSC per family, prospective extensive ophthalmologic examination was performed, including best-corrected visual acuity, indirect ophthalmoscopy, digital color fundus photography, optical coherence tomography, fundus autofluorescence, and fluorescein angiography imaging. From these, 24 individuals from 6 families had undergone extensive ophthalmologic examination in either 1994 or 1995 and were followed up in this study.

View Article and Find Full Text PDF

Importance: Myopia (ie, nearsightedness) is becoming the most common eye disorder to cause blindness in younger persons in many parts of the world. Visual impairment due to myopia is associated with structural changes of the retina and the globe because of elongation of the eye axis. How axial length-a sum of the anterior chamber depth, lens thickness, and vitreous chamber depth-and myopia relate to the development of visual impairment over time is unknown.

View Article and Find Full Text PDF

Purpose: To investigate whether patients who developed chronic central serous chorioretinopathy (cCSC) in association with corticosteroid treatment respond differently to photodynamic therapy (PDT) as compared to patients who have not used corticosteroids.

Methods: Clinical evaluation included visual acuity (VA), fundoscopy, optical coherence tomography (OCT), fluorescein and indocyanine green angiography. The main outcome measure was a complete resolution of subretinal fluid (SRF) on OCT after PDT.

View Article and Find Full Text PDF

Purpose: To evaluate the outcome of a prospective protocol for the treatment of chronic central serous chorioretinopathy (CSC).

Methods: Interventional prospective case series in 59 eyes (59 patients) with active chronic CSC. All patients were first treated with indocyanine green angiography (ICGA)-guided half-dose photodynamic therapy (PDT).

View Article and Find Full Text PDF