Experimentally induced steroid cataract in the rat: a scanning electron microscopic study

Area of Science:

• Ophthalmology
• Histopathology
• Radiology

Background:

• Cataracts are a leading cause of vision loss worldwide.
• Steroid use is a known risk factor for cataract development.
• The synergistic effects of radiation and steroids on cataractogenesis require further elucidation.

Purpose of the Study:

• To investigate the histopathological changes in experimentally induced steroid cataracts.
• To evaluate the role of low-dose X-ray irradiation as a cocataractogenic factor in steroid cataract formation.
• To compare the effects of topical versus systemic prednisolone administration on cataract development.

Main Methods:

• Brown-Norway rats were used, with cataracts induced by topical or systemic prednisolone acetate over 12 months.
• A single dose of 2 Gy X-ray irradiation was administered to the right eyes prior to drug treatment.
• Lens opacification was monitored using slit-lamp biomicroscopy and an anterior eye segment analysis system, with scanning electron microscopy performed at 12 months.

Main Results:

• Both topical and systemic prednisolone induced anterior and posterior subcapsular opacification.
• X-ray irradiation significantly increased the grade and speed of lens opacification in both treatment groups.
• Scanning electron microscopy revealed marked damage to lens fibers in X-ray-irradiated eyes, particularly with systemic prednisolone.

Conclusions:

• Low-dose X-ray irradiation plays a cocataractogenic role, exacerbating steroid-induced cataracts.
• The combination of X-rays and steroids leads to more severe histopathological changes in the lens.
• These findings highlight the importance of considering radiation exposure in patients undergoing long-term steroid therapy.