Biomedical subjects

Jen-Chieh Lin

Publications and source records attributed to Jen-Chieh Lin.

3 recordsLinked to original sources

PubMed2003

RK4 (reverse-geometry) contact lens fitting after penetrating keratoplasty.

PURPOSE: We evaluated the performance of the RK4 (reverse-geometry) contact lens in patients with flat central and steep peripheral corneal topography after penetrating keratoplasty (PK). METHODS: A retrospective study was performed of post-PK patients fitted with RK4 lenses on the Cornea Service at Wills Eye Hospital, between March 2000 and February 2002. RESULTS: Fifteen eyes of 13 post-PK patients were fitted with RK4 lenses and monitored for more than two months (range, 2.1-23.5 months; mean, 8.1 +/- 7.0 months). The average number of lens refits per eye was 1.0 +/- 1.2 (range, 0-4). Ninety-three percent (14/15) of the eyes that were fitted achieved at least 20/30 visual acuity, and 53% (8/15) of eyes achieved 20/20 visual acuity. A comparison of prefitted and post-fitted corrected visual acuity demonstrated a statistically significant improvement (P < 0.01). RK4 lenses were successfully worn full time or part time in all cases. CONCLUSIONS: The RK4 lens can provide well-tolerated visual correction in cases with central flat, peripheral steep corneal contour following PK.

Adult↗

PubMed2003

RK4 lens fitting for a flap striae in a LASIK patient.

PURPOSE: To present a case in which an RK4 lens was fitted for a patient who developed flap striae resulting from laser-assisted in situ keratomileusis (LASIK). METHODS: Case report. RESULTS: A 44-year-old man underwent uncomplicated LASIK procedure for bilateral myopia and astigmatism. Visually significant flap striae (OS>OD) were noted postoperatively. The flaps were relifted, refloated, and stretched twice in each eye. In addition, OD enhancement laser treatment was performed. Nevertheless, decreased best-corrected visual acuity (OS>OD) persisted. One month after LASIK, the patient was referred to our office for a second opinion and further evaluation. To avoid additional manipulation of the flaps, we used an RK4 lens fitting to achieve a final corrected visual acuity of 20/20 OU. CONCLUSIONS: Persistent, visually significant flap striae following flap, refloating, stretching, and smoothing techniques can make LASIK patients unhappy. An RK4 lens fitting is an alternative method for correcting postoperative irregular astigmatism and to achieve the best-corrected visual acuity.

Adult↗

PubMedDate not supplied

An "exploding cataract" following Nd:YAG laser iridectomy.

A case of an "exploding" cataract (an iatrogenic posterior capsular rupture) following Nd:YAG laser iridectomy is described. Rapid cataract development was observed in the right eye of a 76-year-old woman following an iridectomy. B-scan ultrasonography documented cortical debris in the vitreous cavity. The patient underwent an extracapsular cataract extraction and intraocular lens implantation. During the cataract extraction, a posterior capsular tear extending from the 10-o'clock to the 4-o'clock position was noted, through which fluffy cortical material was floating in the vitreous.

Aged↗