糖尿病性黄斑水肿激光治疗前后视网膜功能的定量研究

目的：探讨激光光凝对糖尿病黄斑水肿患者视网膜功能的影响。
　　方法：连续选取2010-03/2014-03我院眼科经眼底血管造影检查确诊为糖尿病性黄斑水肿行黄斑格栅光凝的患者19例30眼,于治疗前及黄斑格栅光凝治疗后3 mo均行多焦视网膜电图检查,并对其结果进行统计学分析。
　　结果：激光治疗后中心凹处 a、b 波振幅密度升高,与治疗前相比存在统计学差异( t=-3.7683, P<0.01;t=-3.6570,P<0.01);激光治疗前后a、b波潜伏期无统计学差异(t=1.7103,P>0.05;t=1.5623,P>0.05)。激光治疗后黄斑区a、b波振幅密度均升高,与治疗前相比存在统计学差异(t=4.8337,P<0.01;t=-2.0376,P<0.05);激光治疗后黄斑区a、b波潜伏期均延长,与治疗前相比均存在统计学差异( t=-2.1892, P<0.05;t=-3.5024, P<0.01)。激光治疗前后黄斑外区a、b波振幅密度均无统计学差异(t=-1.4387,P>0.05;t=-0.1766,P>0.05);激光治疗后黄斑外区a、b波潜伏期均延长,与治疗前相比均存在统计学差异(t=-2.0905,P<0.05;t=-2.5646,P<0.05 ) 。
　　结论：激光光凝治疗改善了中心凹处视网膜的功能,有益于视力的改善,但激光光凝治疗糖尿病性黄斑水肿对黄斑区和黄斑外区视网膜的功能有广泛的破坏作用。     

视网膜颞上分支静脉阻塞合并黄斑水肿的多焦视网膜电图特征

目的 分析视网膜颞上分支静脉阻塞合并黄斑水肿的多焦视网膜电图各参数的特征.方法 时视网膜颞上分支静脉阻塞合并黄斑水肿的病例进行多焦视网膜电图检查,分析其一阶反应,比较不同程度黄斑水肿、患眼与对侧眼N1、P1波振幅密度及潜伏期的差异.结果 局限性黄斑水肿组1环N1波振幅密度和潜伏期分别为:(25.17±2.45)nV·deg-2、(20.48±5.02)ms,黄斑囊样水肿组分别为(18.26±2.20)nV·deg-2、(24.07±3.49)ms,2组间比较差异均有统计学意义(分别为P=0.040、P=0.035);P1波振幅密度在局限性黄斑水肿组为(63.26±22.02)nV·deg-2,弥漫性黄斑水肿组为(42.03±16.25)nV·deg-1,黄斑囊样水肿组为(41.71±15.24)nV·deg-2,3组间差异均有统计学意义(均为P＜0.05).患眼1环、2环及3～5环N1、P1波振幅密度及N1波潜伏期与时侧眼差异有统计学意义(P＜0.05);2环P1波潜伏期与对侧眼差异存在统计学意义(P＜0.05).患眼颞上象限N1波和P1振幅密度分别为(6.24±3.18)nV·deg-2、(15.53±7.52)nV·deg-2,N1波和P1波潜伏期分别为(22.24±1.93)ms、(40.37±3.56)ms,与对侧眼比较差异均有统计学意义(均为P＜0.05).结论 视网膜分支静脉阻塞合并黄斑水肿在多焦视网膜电图上表现以中心凹处的改变最明显;P1波振幅密度及N1波潜伏期可做为敏感评价指标.     

正常眼多焦视网膜电图特征的初步探讨

目的 :初步分析正常人眼多焦视网膜电图 (m ERG)测量值 ,并探讨正常眼视网膜后极部不同部位的电生理功能。方法 :对 19例 (2 5眼 )散瞳正常眼作多焦视网膜电图检查 ,记录 6 1个部位反应波形图 ,分析视网膜后极部不同区域的a波 (第 1个负波 )和b波 (第 1个正波 )的潜伏期、振幅值及振幅密度。结果 :视网膜后极部中心环 (第 1环 )振幅密度为最高 ,a波为 (33.92± 18.95 )nV/deg2 ,b波为 (6 8.78±19.84 )nV/deg2 ,随着离心度的增加 ,各振幅密度逐渐下降 ,差异有显著性 (P <0 .0 1)。a波及b波潜伏期、振幅及振幅密度在四个象限的差异均无显著性 (P >0 .0 5 )。结论 :多焦视网膜电图能客观、定位、定量地测定视网膜后极部不同部位的视功能 ,其测定的正常值为临床研究提供了参考数值     

隐匿性黄斑营养不良临床分析

目的 探讨隐匿性黄斑营养不良患者的临床特点。方法 回顾性病例系列研究。隐匿性黄斑营养不良患者9例（14只眼）,其中男性3例,女性6例;年龄7 ～ 53岁,平均36岁。患眼行视力、双目间接检眼镜、荧光素眼底血管造影、视网膜电图(ERG)、多焦ERG、视诱发电位、相干光断层扫描及色觉等检查。患者组与正常对照组多焦ERG的1环和2环P1波的潜伏期、振幅密度比较,采用两独立样本t检验;患眼多焦ERG的1环和2环P1波的潜伏期、振幅密度与视力的相关性采用一元线性相关分析。结果 9例（14只眼）隐匿性黄斑营养不良患者中,视力0.05 ～0.2者9只眼,0.3 ～0.6者4只眼,≥0.7者1只眼。所有患者均表现为进行性视力下降,但眼底检查、荧光素眼底血管造影、ERG检查均未见明显异常,仅多焦ERG检查结果显示黄斑中心区功能受损。1环P1波潜伏期：患者组(27.67±1.07) ms,对照组(26.28±1.88) ms,两组间比较差异有统计学意义(t=-2.308,P＜0.05);1环P1波振幅密度：患者组(42.71±15.48) nv/deg2,对照组(66.79±14.87) nv/deg2,两组间差异有统计学意义(t =5.259,P＜0.05)。2环P1波潜伏期：患者组(27.80±1.20)ms,对照组(26.91±0.82)ms,两组间差异有统计学意义（t=-2.275,P＜0.05）;2环P1波振幅密度：患者组(24.99±8.49) nv/deg2,对照组(39.20±6.47) nv/deg2,两组间差异有统计学意义(t=4.943,P＜0.05)。患者组1环和2环P1波的潜伏期（r=-0.329,-0.369）和振幅密度(r=0.053,0.057)与视力均无相关性(P＞0.05)。结论 隐匿性黄斑营养不良患者的主要临床表现为视力下降,而眼底、荧光素眼底血管造影、ERG检查均正常,多焦ERG改变为黄斑部锥细胞营养不良的主要表现。     

硅油填充眼黄斑前膜剥除术的短期观察

目的:探讨硅油填充眼继发性黄斑前膜的短期手术疗效,评价视网膜内界膜剥除术对疗效的影响。方法:病例对照研究。回顾性分析玻璃体视网膜手术的硅油填充眼继发性黄斑前膜病例65例65眼的临床病例资料,其中单纯剥膜组34例34眼,联合内界膜剥除组31例31眼,随访>3mo。比较各组治疗前和术后3mo的最佳矫正视力,黄斑中央厚度,多焦视网膜电图振幅密度,并作组间比较。结果:单纯剥膜组最佳矫正视力术前4.1±0.3,术后4.5±0.5,黄斑中央厚度术前424±54μm,术后355±43μm,多焦视网膜电图第一环P1振幅密度术前23±7.3nV/deg2,术后26±8.5nV/deg2。联合内界膜剥除组最佳矫正视力术前4.2±0.1,术后4.5±0.4,黄斑中央厚度术前436±68μm,术后348±53μm,多焦视网膜电图第一环P1振幅密度术前24±7.8nV/deg2,术后27±9.7nV/deg2。各组治疗前后差异有统计学意义(P<0.05),组间比较差异均无统计学意义。结论:前膜剥除术治疗硅油填充眼继发性黄斑前膜疗效确切,联合视网膜内界膜剥除对短期预后影响不明显。     

正常人多焦视网膜电图的特征

目的:探讨正常人多焦视网膜电图(multicalelec-troretinogram,mERG)在视网膜的分布特征,以获得正常参考值。方法:应用法国Metrovision公司生产的VisionMonitor视觉诱发系统检测15例(24眼)正常人mERG,检测视野的水平视角±30°,垂直视角±23°,采用ERG-jet接触镜电极,于5min记录61个视网膜部位的反应。结果:黄斑中心凹N1波、P1波、N2波的振幅密度最大,分别为(47.26±19.51)nV/deg2,(118.22±45.08)nV/deg2,(127.55±38.83)nV/deg2,向周边振幅密度逐渐降低;N1波、P1波的颞侧振幅密度较鼻侧大;P1波、N2波的颞上区振幅密度较鼻下区大。黄斑中心凹P1波、N2波的潜伏期均较其他各区缩短。结论:mERG的各波振幅密度与视网膜感光细胞的分布基本一致,能准确、客观的反映视网膜各部位的功能。     

无明显糖尿病视网膜病变的2型糖尿病患者多焦视网膜电图特征分析

目的 观察眼底无明显糖尿病视网膜病变(DR)的2型糖尿病患者的多焦视网膜电图特征.方法 经散瞳检查明确眼底无明显DR的2型糖尿病患者18例32只眼(病例组)纳入研究.其中,男性8例16只眼,女性10例16只眼;平均年龄(57.1±1.3)岁;平均糖尿病病程(10.2±0.3)年;矫正视力均≥1.0.选取同期健康体检者14例14只眼作为正常对照组.其中,男性8例8只眼,女性6例6只眼;平均年龄(53.0±5.6)岁;矫正视力均≥1.0.所有受检者均行多焦视网膜电图检查,观察1～5环N1、P1波的潜伏期和振幅密度,颞侧、鼻侧视网膜的N1、P1波潜伏期及振幅密度.结果 1、2、3环P1波潜伏期病例组分别为(48.47±2.33)、(31.19±15.53)、(15.67±5.73) ms,正常对照组分别为(40.48±3.26)、(35.88±3.64)、(38.92±3.67) ms;两组1、2、3环P1波潜伏期比较,差异有统计学意义(t=5.145、2.376、2.276,P＜0.05).颞侧视网膜P1波振幅密度病例组、正常对照组分别为(9.07±2.19)、(14.13±2.76) nV/deg2;两组颞侧视网膜P1波振幅密度比较,差异有统计学意义(t=-3.468,P＜0.05).结论 2型糖尿病患者在未出现明显DR之前P1波潜伏期即出现延长,颞侧视网膜P1波振幅密度下降.     

眼底无可见视网膜病变的糖尿病患者多焦视网膜电图特征

目的 检测眼底无视网膜病变糖尿病患者的多焦视网膜电图(multifocol electmretinogram, mf-ERG),评价其在糖尿病患者早期视网膜功能改变中的作用.方法 应用mf-ERG检测30例(56只眼)正常对照组和32名(58只眼)无眼底镜下可查见的视网膜病变的糖尿病患者.对两组mf-ERG中a波和b波的潜伏期、振幅总和以及b波的振幅密度进行分析比较.结果 在糖尿病组,除0环和颞下象限之外.b波的潜伏期均明显延迟,而a波和b波振幅总和及b波的振幅密度减低主要集中在黄斑周围区域(0～1环)和颞上象限,差别有统计学意义(P<0.05).结论 mf-ERG能在DR出现之前客观定量地评定视网膜功能的变化程度和范围.     

共同性内斜视弱视眼的多焦视网膜电图分析

目的 与正常人多焦视网膜电图进行比较分析并探讨共同性内斜视弱视眼多焦视网膜电图特征.方法 采用德国Roland公司生产的RETI Scan多焦视觉电生理检查系统对13例20眼共同性内斜视弱视眼(研究组),10例20眼正常眼(正常对照组)进行检测,记录一阶反应的波形与数值,分析其5个环形视网膜区域的反应.结果 研究组3个环形视网膜区域环1、环2、环3的平均反应密度(75.06±22.68)nV·deg-2、(45.96±15.12)nV·deg-2、(32.24±9.49)nV·deg-2,低于正常组(136.15±29.08)nV·deg-2、(65.51±12.33)nV·deg-2、(43.15±11.02)nV·deg-2,振幅(1.12±0.41)μV、(0.89±0.27)μV、(0.89±0.38)μV、低于正常组(1.75±0.49)μV、(1.33±0.29)μV、(1.19±0.29)μV;潜伏期较正常人明显延长[研究组:(47.49±3.54)ms、(43.24±2.91)ms、(41.29±3.59)ms;对照组:(39.92±1.93)ms、(38.01±1.36)ms、(36.24±1.25)ms],2组环1、环2、环3相比差异有统计学意义(P均<0.01),2组环4、环5相比差异无统计学意义(P均>0.01),共同性内斜视弱视眼的视网膜损伤主要发生在黄斑区中心凹处.结论 共同性内斜视弱视眼的多焦视网膜电图反应密度与振幅均降低,潜伏期延长,黄斑中心凹处最为明显,说明共同性内斜视弱视的视网膜损害主要发生在黄斑区中心凹处,存在黄斑抑制,是中心视力损害的因素之一.     

多焦视网膜电图评价视网膜脱离的视网膜功能

目的 探讨多焦视网膜电图(multifocal electroretinography, MERG)对视网膜脱离(retina detachment, RD)的视功能客观评价意义。 方法 应用VERIS 4.0视诱发反应图像系统检测21例RD患者的22只患眼和36例正常人的42只眼的MERG。测试野的水平视角为±26.6°,垂直视角为±22.1°,采用Burian-Allen接触镜电极,在8 min(分16段)记录103个视网膜部位的反应。 结果RD眼于4个象限、黄斑区和黄斑外区MERG a波、b波潜伏期及b波振幅密度、振幅之和均明显低于正常对照组(P<0.01);脱离区、非脱离区和正常眼的 MERG b波振幅密度分别为(3.44±2.85)、(6.34±3.31)、(21.32±6.48)nV/deg²,三者之间的差异均有非常显著性意义(P<0.05)。 结论 多焦ERG能客观定量评价RD的黄斑部、后极部的脱离区和非脱离区的视功能。(中华眼底病杂志,2000,16:244-247)     

Association of electroretinogram and morphological findings in branch retinal vein occlusion with macular edema

The objective of this study is to evaluate the relations among electroretinogram parameters (cone a-wave, cone b-wave, and 30-Hz flicker), retinal thickness, and retinal volume in patients with branch retinal vein occlusion (BRVO) and macular edema. We prospectively examined 33 patients (33 eyes) with BRVO and macular edema. The amplitude and implicit time of the a-wave cone, b-wave cone, and 30-Hz flicker were calculated automatically from the ERG. Retinal thickness and volume were measured by optical coherence tomography (OCT) in nine macular subfields. Then, correlations between the ERG parameters and morphological parameters were analyzed. The 30-Hz flicker amplitude was significantly smaller in the eyes with BRVO and macular edema than in the unaffected contralateral eyes. Thirty-hertz flicker and cone b-wave implicit times were significantly longer in the eyes with macular edema than in the unaffected eyes. The implicit time of the cone b-wave was correlated with both retinal thickness and retinal volume in the temporal subfields. Thirty-hertz flicker amplitude was correlated with both retinal thickness and volume in the temporal and superior outer (site of occlusion) subfields, while 30-Hz flicker implicit time was correlated with retinal thickness and volume in the outer temporal subfield. Multiple regression analysis demonstrated that the retinal thickness and volume of the temporal subfields were significant “determinants” of the implicit time for the cone b-wave and 30-Hz flicker, as well as the 30-Hz flicker amplitude. These findings suggest that OCT parameters of the temporal region may reflect postreceptoral cone pathway function in BRVO patients with macular edema.     

The human focal electroretinogram as a function of stimulus area

Focal electroretinograms to on-off luminance modulation (2.7 Hz) of uniform fields with a different area (144-2.25 deg²) centered on the fovea were recorded in two young normal subjects. The electroretinogram responses typically consisted of an a-wave, a b-wave, a PIII component and a d-wave. The concentric reduction of the test field size caused progressive amplitude decrement of all components, while their response density increased. The spatial summation properties of the b-wave differed from those of the a-wave, PIII component and d-wave so that the relative contribution of the b-wave to the electroretinogram waveform depended on the stimulus area. For a critically small field size, the electroretinogram was dominated by the PIII and d-wave components. Only these two electroretinogram components displayed a density profile that could be compared with that of cone distribution.     

Morphological and functional changes of the macula after vitrectomy and creation of posterior vitreous detachment in eyes with diabetic macular edema

The purpose of this study was to determine the morphological and functional changes in the macula after pars plana vitrectomy with the creation of a posterior vitreous detachment in eyes with diabetic macular edema (DME). A simple posterior vitreous detachment was created during pars plana vitrectomy accompanied by simultaneous cataract surgery in 19 eyes of 17 patients with DME. The visual acuity (log MAR units), multifocal electroretinograms (mfERGs), and optical coherence tomographically (OCT)-determined foveal thickness were determined preoperatively and at 6 months postoperatively. The median preoperative log MAR visual acuity was 0.7 (20/100; range, 0.3–1.1), and it improved significantly to 0.4 (20/50; range, 0.15–1.0) postoperatively (p = 0.016). The median foveal thickness was 510 (range, 194–800) m preoperatively and was significantly reduced to 201 (range, 60–631) m postoperatively (p =0.0002). The median of response density of the mfERGs in the macular area was 6.3 nV/deg² (range, 2.8–14.8) preoperatively, and 6.1 nV/deg² (range, 2.4–14.3) postoperatively, a non-significant change (p = 0.27). The median of peak latency of the macular response was 30.0 ms (range, 25.0–44.2) preoperatively and it decreased significantly to 28.3 ms (range, 26.7–35.0) postoperatively (p = 0.003). In conclusion, vitrectomy with the creation of a PVD in eyes with DME improved the visual acuity and foveal thickness significantly. In addition, a decrease of the peak latency of the macular mfERGs suggested an improvement of the physiological function of the macula although the amplitude of the mfERGs was not changed significantly.     

运用多焦视网膜电流图评价羟氯喹对黄斑中心视功能的影响

目的:运用多焦视网膜电流图(MFERG)评估服用羟氯喹后视网膜黄斑中心视锥系统功能变化情况。方法:回顾性研究。将2017-01/2019-11于解放军总医院第一医学中心眼科进行检查的类风湿性关节炎患者132例264眼纳入分析。根据服药时间分为6组:A组38例76眼未服药,B组38例76眼服药1a,C组17例34眼服药2a,D组18例36眼服药3a,E组13例26眼服药5a,F组8例16眼服药5a以上停药3a。比较各组患者最佳矫正视力(BCVA)、MFERG中央第一环视网膜反应区P 1波振幅密度值的变化情况。结果:A~F组患者BCVA(0.11±0.11、0.11±0.10、0.13±0.10、0.15±0.10、0.15±0.11、0.14±0.10LogMAR)无明显差异(F=1.287,P=0.270),但A组患者P 1波振幅密度值(122.68±1.87nV/deg 2)明显高于其他组(115.76±1.71、113.38±1.51、109.10±2.52、94.61±0.78、94.02±0.91nV/deg 2,均P<0.05)。结论:长期服用羟氯喹后,即使中心视力未发生改变,MFERG检查结果显示视网膜黄斑中心视锥系统随着服药时间延长,其功能呈下降趋势,且停药后视功能不能恢复。     

Treatment of Vogt-Koyanagi-Harada Disease by Corticosteroids and Immunosuppresive Agents

Objective: To describe the response of uveitic macular edema to various treatment methods using optical coherence tomography (OCT). Methods: This is a prospective study of consecutive uveitis patients with macular edema in at least one eye. The patients received medical treatment. Best corrected Snellen Visual Acuity (BCVA) and tomographic features of the macula, including macular thickness measurement, were obtained at one, three, six, and 12 months after commencing treatment. Results: Eighty-one eyes of 58 patients were analyzed. Complete resolution of macular edema occurred in 38 eyes (47%). The average BCVA was 20/34 logarithm of minimum angle of resolution (-logMAR, 0.2 ± 0.3) upon study entry and 20/27 (-logMAR, 0.13 ± 0.29) upon study completion. The difference was statistically significant (p = 0.04). The corresponding mean retinal thickness at the central fovea was 319 ± 150 μm at the beginning of the study compared to 241 ± 125 μm at 12 months (p < 0.001). A weak but statistically significant correlation between the reduction of macular thickness and the improvement of BCVA (r = 0.3, p = 0.01) was found. Thirteen of the 43 eyes (30%) with persistent macular edema had a more than 15% reduction of macular thickness compared to baseline, whereas 10 eyes (23, 3%) had a more than 15% increase in macular thickness. Statistical analysis indicated that the presence of an epiretinal membrane and an OCT pattern of diffuse macular edema was a significant factor associated with medical treatment failure. Conclusion: This study demonstrates the overall favorable visual prognosis of uveitic macular edema under medical treatment. The presence of an epiretinal membrane is an important factor associated with medical treatment failure.     

Focal macular photopic negative response in patients with optic neuritis

Purpose

To investigate, by focal macular electroretinography (ERG), the change of photopic negative response (PhNR) in the recovery of visual function in patients with optic neuritis.

Methods

Focal macular ERG was recorded from nine patients with acute optic neuritis (38.6±10.2 years). The photostimulator device projected 15° visual angle spotlight onto the macula. Focal macular ERG recording was performed at the onset and at 1 month and 6 months after the onset of optic neuritis. The results were compared between each recording for seven of the patients.

Results

All patients decreased in the vision below 20/100 and had central scotoma. Vision improved more than 20/20 within 1 month and full-visual field recovered within 6 months after the onset in all patients. The amplitude of the a-wave, b-wave, and PhNR of focal macular ERG at the onset was significantly attenuated in eyes with optic neuritis (66.8±15.5, 65.8±17.7, and 65.2±14.4% of normal control, respectively). The amplitude of the a-wave and b-wave increased gradually after steroid pulse therapy. The increase in a-wave amplitude was significant at 6 months (P=0.046), whereas the PhNR amplitude did not show any significant change over 6 months after the onset of optic neuritis.

Conclusions

Our results suggest that inflammation at the onset of optic neuritis leads to functional deficits that extend to at least the inner nuclear layers of the retina, and that all but the ganglion cell layers of retina recover.     

Focal macular electroretinogram in high myopia

To investigate early changes of the macula in eyes with myopia, we compared 66 eyes with high myopia with 76 normal eyes by recording focal macular electroretinogram (ERG). The eyes with high myopia were divided into two groups; eyes showing only tigroid fundus (group 1) and those associated with posterior staphyloma involving the macula (group 2). The visual acuity of groups 1 and 2 was 1, 0 or better and 0.8 or better, respectively. The amplitude of the a-wave, b-wave in group 1 was significantly smaller than that of normal eyes, however the peak latency was within the normal range. The amplitude of a-wave, b-wave and oscillatory potentials in group 2 was significantly smaller and the peak latency was significantly longer than those in group 1. The abnormal amplitude with normal peak latency in group 1 suggests some reduction of numbers of cones, which is considered to be an early pathologic change in the macula with high myopia. The more reduced amplitude with delayed peak latency in group 2 suggests that, in the advanced stage, the macular pathologic finding includes some quantitative damage as well as further reduction of macular cones.     

视网膜中央静脉阻塞性黄斑水肿的OCT与ERG的对比分析

目的：观察视网膜中央静脉阻塞性黄斑水肿的黄斑区视网膜厚度与视网膜电图( electroretinogram, ERG )各项参数(Cone-a,Cone-b和30Hz)变化的关系。
　　方法：随机选择视网膜中央静脉阻塞患者25例25眼及25只对侧眼分别行明视闪光视网膜电图及光学相干断层扫描( optical coherence tomography,OCT)检查,明视闪光视网膜电图检查测各项参数的振幅和潜伏期, OCT测量黄斑区九部分的视网膜厚度,分析黄斑区形态参数与明视闪光视网膜电图各参数变化之间的关系。
　　结果：黄斑区除颞侧外七个部位视网膜厚度与 ERG 的Cone-b和30 Hz潜伏期相关。
　　结论：研究发现视网膜中央静脉阻塞患者的黄斑区视网膜厚度与内层视网膜功能密切相关。     

Effects of intravitreal indocyanine green injection in rabbits

PURPOSE: To report the clinical, electrophysiologic, and histologic findings of different concentrations of indocyanine green (ICG) injected into the vitreous cavity of rabbit eyes. METHODS: Forty-two rabbits underwent intravitreal injection of 0.1 mL of ICG in three different concentrations: 0.5 mg/mL (250 mOsm), 5 mg/mL (270 mOsm), and 25 mg/mL (170 mOsm). Fellow eyes were injected with 0.1 mL of balanced salt solution. Biomicroscopy, ophthalmoscopy, electroretinography, fluorescein angiography, and histologic evaluation were performed. RESULTS: Eyes injected with 0.5 mg/mL of ICG showed b-wave latency delay on the first day after injection. Eyes injected with 5 mg/mL of ICG showed b-wave latency delay and decreased b-wave amplitude on the first and seventh days after injection; delayed a-wave latency on the first day after injection was also observed. Eyes injected with 25 mg/mL of ICG showed b- and a-wave amplitude and latency abnormalities during the entire follow-up. Direct correlation of increasing retinal edema proportional to the progressively increasing ICG concentrations was shown on histologic evaluation. CONCLUSION: Intravitreal ICG injection in rabbit eyes may impair retinal function and morphology proportional to the progressively increasing ICG dosages.