Rapidly Progressive Bilateral Metabolic Cataract in an Adolescent with Type 1 Diabetes Mellitus: A Case Report

Although advances in diabetes management have markedly improved prognosis and quality of life, inadequate glycemic control continues to pose a substantial risk for both acute metabolic disturbances and chronic microvascular complications. Among these, ocular involvement is particularly concerning, as it may lead to significant and potentially irreversible visual impairment if not recognized and managed promptly [1,2].

While diabetic retinopathy is the most commonly highlighted ocular complication of type 1 diabetes mellitus (T1DM), cataract formation represents an important yet often underrecognized manifestation. Metabolic cataracts in pediatric age are uncommon; however, they can be among the earliest clinical signs of undiagnosed diabetes or may develop within the first months following diagnosis, especially in cases of delayed recognition or persistently poor glycemic control [2-4].

A 14-year-old female presented to the emergency department with an history of polyuria, polydipsia, polyphagia, and unintentional weight loss. Initial laboratory evaluation confirmed new-onset T1DM without ketoacidosis. Hemoglobin A1c (HbA1c) was >14%, and autoimmune screening revealed positive anti-GAD65 antibodies (141.7 UI/ml) and anti-islet cell antibodies (14.71 UI/ml). Screening for associated autoimmune comorbidities, including celiac disease, pernicious anemia, and autoimmune thyroid disease, was negative. Baseline evaluation for diabetes-related complications, including retinopathy or metabolic cataract (figure 1), nephropathy, neuropathy, dyslipidemia, and hypertension, showed no abnormalities.

She remained under outpatient follow-up in pediatric endocrinology but adherence to insulin therapy and glycemic monitoring was inconsistent. During follow-up, her HbA1c was 7.8%, with 39% of glycemic readings above the target range and 3% below.

Ten months after diagnosis of T1DM, the patient returned to the emergency department reporting rapidly progressive unilateral visual impairment in the right eye over the preceding week, without history of ocular trauma. Ophthalmologic examination revealed lens opacity in the right eye, consistent with metabolic cataract, with no evidence of microvascular retinopathy or other ocular abnormalities (figure 2). She was scheduled for outpatient ophthalmology consultation and surgical planning. However, within 15 days, the cataract progressed rapidly, involving the contralateral eye and resulting in near-complete bilateral visual loss.

The patient underwent bilateral phacoemulsification with intraocular lens implantation. The postoperative course was favorable, with resolution of visual symptoms and restoration of functional vision.

Metabolic cataract is a rare but clinically relevant complication of T1DM, particularly in pediatric and adolescent populations. In contrast to diabetic retinopathy, which typically develops only after prolonged periods of chronic hyperglycemia, metabolic cataracts may occur early in the disease course and can even constitute the first clinical indicator of undiagnosed T1DM [2-4].

The pathophysiology of metabolic cataract is primarily linked to activation of the polyol pathway. In chronic hyperglycemia, excess glucose is converted to sorbitol by aldose reductase, and because sorbitol diffuses poorly across cell membranes, it accumulates within the lens. This leads to increased osmotic pressure, water influx, lens fiber swelling, and loss of transparency. Oxidative stress and non-enzymatic glycation of lens proteins may further destabilize lens architecture [5-7].

Clinically, metabolic cataract may present with rapidly progressive visual impairment, blurred vision, and, in severe cases, marked loss of visual function [4,8]. The risk is higher in patients with prolonged hyperglycemia, markedly elevated HbA1c levels, and a long symptomatic period preceding the diagnosis of diabetes [3,8].

Adolescents with T1DM may be particularly vulnerable to metabolic cataract due to lifestyle-related challenges influencing treatment adherence, including psychosocial stressors, transition of responsibility for self-care, and difficulties maintaining consistent glucose monitoring and insulin administration [9,10]. In the present case, glycemic patterns reflected substantial time above target range despite a seemingly acceptable HbA1c, suggesting significant glycemic variability. Such fluctuations are increasingly recognized as independent contributors to diabetes-related complications, even in the absence of extreme hyperglycemia [11,12].

Although guidelines vary slightly among organizations, early ophthalmologic surveillance is essential. American Diabetes Association recommend initiating routine screening 3–5 years after the diagnosis of T1DM, provided the child is at least 11 years of age or has entered puberty (whichever occurs first), with follow-up every 2-year thereafter [13]. However, ophthalmologic assessment should be performed earlier in the presence of visual symptoms, poor glycemic control, or clinical suspicion of ocular complications [3,2,13].

Prompt recognition is critical, as early intervention can prevent long-term visual impairment [14]. Surgical management with phacoemulsification and intraocular lens implantation generally offers favorable outcomes, as observed in this patient, who experienced complete recovery of visual function following bilateral surgery [9,15].

This case reinforces the importance of maintaining optimal glycemic control from the earliest stages of disease and highlights the need for multidisciplinary care involving pediatric endocrinology, ophthalmology, and psychosocial support services. Improving adherence strategies—through continuous glucose monitoring systems, structured diabetes education, family support, and psychological intervention when appropriate—may help reduce the risk of early metabolic complications such as cataract.

The authors declare that there were no conflicts of interest in carrying out this work.

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