Clinical trial NCT01901744: Contrast Sensitivity Assessment in Pediatric Cataract Surgery With IOL Implantation
Official title: Contrast Sensitivity Assessment in Pediatric Cataract Surgery With IOL Implantation: A Comparison of Preoperative and Early Postoperative Outcomes
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: NA
Conditions: Contrast Sensitivity
Keywords: Contrast Sensitivity , Pediatric Cataract Surgery,
Lead sponsor: Iladevi Cataract and IOL Research Center
Sponsor class: OTHER
First posted: 2013-07-17
Enrollment: 25
Sex: ALL
Minimum age (years): 1
Maximum age (years): 15
Standard ages: CHILD
Accepts healthy volunteers: no
Allocation: NA
Intervention model: SINGLE_GROUP
Primary purpose: TREATMENT

Brief summary: The study evaluates contrast sensitivity in older children following surgery for lamellar and posterior subcapsular cataracts. Often, pediatric surgeons tend to delay surgery in these children who present beyond the amblyogenic age group. These cataracts are often compatible with reasonable visual acuity and therefore some surgeons prefer to wait for surgery, whereas others tend to operate.

The study evaluates improvement in contrast sensitivity at different spatial frequencies following cataract surgery for lamellar and posterior subcapsular cataracts in older children.

Detailed description: All patients undergoes temporal clear corneal incision, manual anterior continuous curvilinear capsulorhexis, bimanual irrigation/aspiration for lens removal and residual cortex, posterior capsule management based on the age of the patient either manual posterior capsulorhexis (PCCC) upto 6 years or leaving intact posterior capsule and implantation of single-piece AcrySof SN60WF (Alcon Laboratories, Forth Worth, Texas) hydrophobic acrylic IOL in-the-bag. Postoperatively, all the patients are examined first for high contrast sensitivity and then for low contrast at 1 week, 1 and 3 months respectively.

The results are analyzed for corrected distance visual acuity (CDVA) which is recorded in LogMAR units at preoperative and 1 and 3 months postoperatively. Monocular high-contrast Snellen visual assessment for distance is done with the Early Treatment Diabetic Retinopathy Study chart (Vector Vision acuity chart at 100% contrast) with Corrected distance visual acuity CDVA at 4 m under photopic condition.

Similarly at preoperative and 1 and 3 months postoperatively contrast sensitivity testing is also performed using the CSV 1000E sine wave grating test face (Vector Vision, USA) with the patient seated at a distance of 2.5 m from the chart. The test is performed after the patient is adapted to the room luminance for 5 minutes. The non viewing eye was occluded for each measurement, and the best spectacle refractive correction is placed in front of the viewing eye. Testing is being tested under two lighting conditions: photopic (85cd/m2) and mesopic (2.7cd/m2). The contrast sensitivity values are documented in log units. Sensitivity levels at each frequency range from 0.7 to 2.08 (3 cpd), 0.91 to 2.29 (6 cpd), 0.61 to 1.99 (12 cpd), and 0.17 to 1.55 (18 cpd) log units. This testing is performed with the patient wearing their refractive correction in form of spectacles.

Eligibility criteria: Inclusion Criteria:

* Children older than 4 years and lamellar and posterior subcapsular cataracts undergoing cataract surgery with IOL implantation

Exclusion Criteria:

* eyes with traumatic or subluxated cataract,

Primary outcomes:
measure: Contrast Sensitivity at 3, 6, 12 and 18 cycles per degree under photopic and mesopic conditions pre and post cataract surgery
timeFrame: up to 3 months postoperatively
Secondary outcomes:
measure: Improvement in Best Corrected Snellen's Visual Acuity following Cataract Surgery
timeFrame: 1 and 3 months postoperatively
Other outcomes:
Locations:
city: Ahmedabad
country: India
facility: Iladevi Cataract & IOL Research Centre
state: Gujarat
Study officials:
References: