The Usefulness of Aspheric Doublet Lens

Ideal low vision devices used for reading should have a large clear field of view.To determine the usefulness of Aspheric Doublet Lens, we compared visual field, image clarity and reading speed of aids in 100 patients who were prescribed with Aspheric doublet lens, Telemicroscope with plus cap and Hand held magnifier.Aspheric doublet lens was prescribed most commonly.Used lens of optical aids was aspheric doublet lens, aplantic lens, biconvex lens and aspheric lens.Visual field and image clarity of Aspheric doublet lens were wider and clearer than those of other devices.Reading speed of each aid after prescription was improved significantly than before prescription (P=0.01).Reading speed of Aspheric doublet lens was more improved than that of other devices.Therefore Aspheric doublet lens might be useful as reading aids to low vision patients.

A Case of Traumatic Complete Aniridia with Corneal Laceration

Traumatic aniridia is usually accompanied by severe anterior segment disruption including corneal laceration, cataract, and vitreous prolapse into the anterior chamber. We experienced a case of complete traumatic aniridia following corneal laceration without capsular rupture of lens, which has not been reported in Korea. A 28-year-old man had a corneal laceration of his right eye from a screw driver at work, which resulted in complete aniridia with only a remnant of ciliary process and UCVA was 0.08. Primary closure of corneal laceration was performed. During surgery, lens capsule was intact. Visual acuity was reduced 10 days after surgery as cataract developed. Although UCVA was 0.3 at 1 month postoperatively, he was symtomatic with glare due to aniridia.

Clinical Analysis of 350 Low Vision Patients

The number of low vision patients and the demand for low vision rehabilitation are increasing as the life expectancy and visual impairment due to largely untreatable ocular conditions are.It is therefore, imperative to recognize the importance of low vision aids, which have recently been developed actively.To evaluate the efficacy of low vision aids for low vision rehabilitation, we reviewed the clinical records of 350 patients who had visited our low vision clinic more than twice and had been prescribed with low vision aids. According to the data analysed, optic nerve atrophy, macular degeneration and retinitis pigmentosa were the leading causes of visual impairment in those patients.The purposes to visit our low vision clinic were to read books, read letters on the black board, identify a person at a distance, etc.Hand-held magnifiers, aspheric doublet lens and telemicroscope with plus cap were commonly used for near vision, while Keplerian and Galilean telescope were popular aids for distant vision.Visual acuity after prescription was improved when it was compared with that before prescription.Majority of the patients benefited from attending low vision clinic.These results suggest that the optical low vision aids were required to rehabilitate the visually impaired patients.