Retinal Sensitivity in Patients with Type I Diabetes without Retinopathy or with Minor Retinal Changes

Area of Science:

• Ophthalmology
• Diabetology
• Visual Neuroscience

Background:

• Type I diabetes is associated with microvascular complications affecting the retina.
• Early detection of visual impairment is crucial for managing diabetic eye disease.
• Short-wavelength automated perimetry (SWAP) offers a sensitive method for assessing visual field defects.

Purpose of the Study:

• To evaluate the efficacy of SWAP in detecting visual impairment in type I diabetes patients.
• To assess visual sensitivity in diabetic patients with no or minimal retinopathy.
• To compare visual field parameters between diabetic patients and healthy controls.

Main Methods:

• Comparative cross-sectional study involving 73 type I diabetes patients and 30 healthy controls.
• Ophthalmic examination to confirm absence or minimal retinal vascular changes (
• SWAP 24-2 strategy used to assess visual field sensitivity, comparing Mean Deviation (MD) and Pattern Standard Deviation (PSD).

Main Results:

• Significant differences in altered visual field points between diabetic and control groups (p=0.004).
• Diabetic patients showed significantly lower SWAP MD (-2.89 dB vs. -0.20 dB, p<0.001) and higher SWAP PSD (3.12 dB vs. 2.50 dB, p=0.003).
• No significant difference in SWAP parameters between diabetic patients with no lesions versus those with minimal retinopathy.

Conclusions:

• Retinal sensitivity is depressed in type I diabetes patients, as detected by SWAP.
• SWAP can identify visual impairment in diabetic patients irrespective of visible retinal vascular changes.
• This suggests SWAP may detect subclinical visual field defects in early diabetic eye disease.